PT4681N

PT4680 TI1 | Alldatasheet

Document overview

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Technical content

Features

• Dual Outputs (Independently Regulated)
• Power-up/Down Sequencing
• Input Voltage Range: 18V to 36V
• 1500 VDC Isolation
• Temp Range: –40° to 100°C
• High Efficiency: 88%
• Fixed Frequency Operation
• Over-Current Protection (Both Outputs)

Ordering Information

Pt. No. Vo 1/Vo2 PT4681/G6F= 5.0/3.3 Volts PT4682/G6F= 3.3/2.5 Volts PT4683/G6F= 3.3/1.8 Volts PT4685/G6F= 3.3/1.5 Volts PT4686/G6F= 2.5/1.8 Volts PT4687/G6F= 5.0/1.8 Volts Typical Application PT4680 +Vin EN 1* EN 2 –Vin Vo 1 ad jVo 2 ad j Vo 1 Vo 2 COM 9–12 21–24 14–19 L O A D L O A D Vo 1 Vo 2 V 1 Adjust V 2 Adjust +V IN –V IN 20 13

2 COM

• Inverted logic
• Dual Logic On/Off Control
• Over-Temperature Shutdown
• Over-Voltage Protection (Coordinated Shutdown)
• Under-Voltage Lockout
• Input Differential EMI Filter
• Solderable Copper Case
• Safety Approvals (Pending): UL 60950 CSA 22.2 60950 current limit, over-temperature pro- tection, and an input under-voltage lock-out. In addition, both output voltages are designed to meet the power-up/power -down sequencing requirements of popular DSP ICs. The PT4680 series is housed in space-saving solderable copper case. The package does not require a heatsink and is available in both vertical and horizontal configura- tions, including surface mount. The ‘N’ configuration occupies less than 2 in² of PCB area. PT Series Suffix (PT1234x) Case/Pin Order Package Configuration Suffix Code Vertical N (EKD) Horizontal A (EKA) SMD C (EKC) (Reference the applicable package code draw- ing for the dimensions and PC board layout) PT4680 Series 20-A 24-V Input Dual Output Isolated DC/DC Converter SLTS141A (Revised 1/28/2002)

For technical support and more information, see inside back cover or visit www.ti.com Pin Descriptions +Vin: The positive input supply for the module with respect to –Vin. If powering the module from a -24V telecom central office supply, this input is connected to the primary system ground. –Vin: The negative input supply for the module, and the 0VDC reference for the EN 1, EN 2, TEMP, and AUX signals. When the module is powered from a +24V supply, this input is connected to the 24V Return. EN 1: The negative logic input that enables the module output. This pin is TTL compatible and referenced to –V in. A logic ‘0’ at this pin enables the module’s outputs. A logic ‘1’ or high impedance disables the module’s outputs. If not used, the pin must be connected to –V in. EN 2: The positive logic input that enables the module output. This pin is TTL compatible and referenced to –V in. A logic ‘1’ or high impedance enables the module’s outputs. If not used, the pin should be left open circuit. TEMP: This pin produces an output signal that tracks the module’s metal case temperature. The output voltage is referenced to –V in and rises approximately 10mV/°C from an intital value of 0.1VDC at -40°C Temp =0.5 + 0.01·TCase). The signal is available whenever the module is supplied with a valid input voltage, and is independant of the enable logic status. (Note: A load impedance of less than 1M Ω will adversly affect the module’s over-temperature shutdown threshold. Use a high-impedance input when monitoring this signal.) AUX: Produces a regulated output voltage of 11.6V ±5%, which is referenced to –V in. The current drawn from the pin must be limited to 10mA. The voltage may be used to indicate the output status of the module to a primary referenced circuit, or power a low-current amplifer. Vo 1: The higher regulated output voltage, which is referenced to the COM node. Vo2: The lower regulated output voltage, which is referenced to the COM node. COM: The secondary return reference for the module’s two regulated output voltages. It is DC isolated from the input supply pins. Vo

1 Adjust: Using a single resistor, this pin allows Vo1

to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo2 Adjust: Using a single resistor, this pin allows Vo2 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. On/Off Logic Pin 3 Pin 4 Output Status 1 × Off

01 O n

× 0 Off Pin-Out Information Pin Function 1+ V in 2- V in

3 EN 1

4 EN 2

5 TEMP

6 AUX

7 Do Not Connect

8 Do Not Connect

13 Vo 1 Adjust

14 COM

15 COM

16 COM

17 COM

18 COM

Notes: Logic 1 =Open collector Logic 0 = –Vin (pin 2) potential For positive Enable function, connect pin 3 to pin 2 and use pin 4. For negative Enable function, leave pin 4 open and use pin 3. Note: Shaded functions indicate signals that are referenced to the input (-Vin) potential. Pin Function

19 COM

20 Vo 2 Adjust

25 Do Not Connect

26 Do Not Connect

20-A 24-V Input Dual Output Isolated DC/DC Converter

For technical support and more information, see inside back cover or visit www.ti.com Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, & Io1=Io2=10A) PT4680 SERIES Characteristics Symbols Conditions Min Typ Max Units Output Current Io 1 Vo1 0— 1 5 AIo2 Vo2 0— 1 5 Io1+Io2 Total (both outputs) 0 — 20 (1) A Input Voltage Range V in 18 24 36 V Set Point Voltage Tolerance V ot o l —± 1± 2% V o Temperature Variation ∆Regtemp –40 to +100°C Case, Io1 =Io2 =0A — ±0.5 — %V o Line Regulation ∆Regline Over Vin range with Io1=Io2=5A — ±5 ±10 mV Load Regulation ∆Regload 1A ≤Io1 ≤15A, Io2 =1A ∆Vo1 — ±2 ±10 mV1A ≤Io2 ≤15A, Io1 =1A ∆Vo2 — ±2 ±10 Cross Regulation ∆Regcross 1A ≤Io2 ≤15A, Io1 =1A ∆Vo1 — ±2 ±10 mV1A ≤Io1 ≤15A, Io2 =1A ∆Vo2 —± 2± 5 Total Output Variation ∆Votol Includes set-point, line load, ∆Vo1 —± 2± 3 %Vo–40°C to +100°C case ∆Vo2 —± 2± 3 Efficiency η Io1 =1o2 =10A PT4681 — 88 — PT4682 — 87 — PT4683 — 87 — PT4685 — 86 — % PT4686 — 85 — PT4687 — 86 — Vo Ripple (pk-pk) V r Io1=Io2=5A, 20MHz bandwidth V o =5V — — 75 mVppVo <5V — — 50 Transient Response t tr 1A/µs load step from 50% to 100% Iomax — 25 100 µSec (either output) — 6.0 — %V o Current Limit I lim Each output with other unloaded 15.5 18 — A Output Rise Time V on At turn-on to within 90% of Vo — 5 10 mSec Output Over-Voltage Protection OVP Either output; shutdown and latch off — 125 (2) —% V o Switching Frequency f s 280 — 320 kHz Under-Voltage-Lockout UVLO Rising — 17 18 VFalling 15 16 — Internal Input Capacitance C in —2 —µ F On/Off Control Referenced to –V in Input High Voltage V IH 3.5 — — V Input Low Voltage V IL 0 — 0.8 (3) Input Low Current I IL — 0.5 — mA Quiescent Current I in standby Pins 2, 3, & 4 connected — 3 5 mA External Output Capacitance C out Per each output 0 — 5,000 µF Primary/Secondary Isolation V iso 1500 — — V C iso — 1500 — pF R iso 1 0——M Ω Temperature Sense V temp Output voltage at temperatures:- –40°C — 0.1 (4) — V100°C — 1.5 (4) — Over-Temperature Shutdown OTP Case temperature (auto restart) — 110 — °C Operating Temperature Range T a Over Vin range –40 — +85 (5) °C Storage Temperature T s — –40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Vertical — 10 (6) — G’sPer Mil-STD-883D, 20–2,000Hz Horizontal — 20 (6) — Weight — — — 90 — grams Flammability — Materials meet UL 94V-0 Notes: (1) The sum-total current from Vo 1 & Vo2 must not exceed 20ADC. (2) This is a fixed parameter. Adjusting Vo 1 or Vo2 higher will increase the module’s sensitivity to over-voltage detection. For more information, see the application note on output voltage adjustment. (3) The EN 1 and EN2 control inputs (pins 3 & 4) have internal pull-ups and may be controlled with an open-collector (or open-drain) transistor. Bo th inputs are diode protected and can be connected to +V in. The maximum open-circuit voltage is 5.4V. (4) Voltage output at “TEMP” pin is defined by the equation:- V TEMP = 0.5 + 0.01·T, where T is in °C. See pin descriptions for more information. (5) See SOA curves or consult the factory for the appropriate derating. (6) The case pins on the through-holed package types (suffixes N & A) must be soldered. For more information see the applicable package outline drawing. PT4680 Series 20-A 24-V Input Dual Output Isolated DC/DC Converter

For technical support and more information, see inside back cover or visit www.ti.com Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. Typical Characteristics PT4681 (Vo1/Vo2 =5.0V/3.3V); Vin =24V (See Notes A & B) Efficiency vs Io 1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo1 vs Io2 @Io1 =1A Cross Regulation: Vo2 vs Io1 @Io2 =1A Efficiency vs Io1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) PT4681—24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 4.95 4.975 5.025 5.05 0369 1 2 1 5 I2 out (A) V1 out (V) 3.28 3.29 3.3 3.31 3.32 0369 1 2 1 5 I1 out (A ) V 2 out (V) 0369 1 2 1 5 I1 out (A ) Pd - Watts I2 out 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 100 0 3 6 9 12 15 I1 out (A ) Efficiency - % I2 out 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. PT4682 (Vo1/Vo2 =3.3V/2.5V); Vin =24V (See Notes A & B) Efficiency vs Io 1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo1 vs Io2 @I1out =1A Cross Regulation: Vo 2 vs Io1 @Io2 =1A Efficiency vs Io 1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) Typical CharacteristicsPT4682— 24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 100 0 3 6 9 12 15 I1 out (A ) Efficiency - % I2 out 3.28 3.29 3.3 3.31 3.32 0369 1 2 1 5 I2 out (A) V1 out (V) 2.48 2.49 2.5 2.51 2.52 0369 1 2 1 5 I1 out (A) V2 out (V) 0369 1 2 1 5 I1 out (A ) Pd - Watts I2 out 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 300LFM 100LFM 200LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. Typical Characteristics PT4683 (Vo1/Vo2 =3.3V/1.8V); Vin =24V (See Notes A & B) Efficiency vs Io 1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo 1 vs Io2 @Io1 =1A Cross Regulation: Vo2 vs Io1 @Io2 =1A Efficiency vs Io 1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) PT4683— 24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 3.28 3.29 3.3 3.31 3.32 0369 1 2 1 5 I2 out (A) V1 out (V) 0 3 6 9 12 15 I1 out (A ) Pd - Watts I2 out 1.78 1.79 1.8 1.81 1.82 0369 1 2 1 5 I1 out (A) V2 out (V) 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Efficiency vs Io 1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo 1 vs Io2 @Io1 =1A Cross Regulation: Vo 2 vs Io1 @Io2 =1A Efficiency vs Io1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) Typical Characteristics PT4685 (Vo1/Vo2 =3.3V/1.5V); Vin =24V Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. PT4685— 24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 100 0369 1 2 1 5 I1 out (A) Efficiency - % I2 out 100 0 3 6 9 12 15 I1 out (A ) Efficiency - % I2 out 3.28 3.29 3.3 3.31 3.32 0369 1 2 1 5 I2 out (A) V1 out (V) 0 3 6 9 12 15 I1 out (A) Pd - Watts I2 out 1.48 1.49 1.5 1.51 1.52 0369 1 2 1 5 I1 out (A) V2 out (V) 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. PT4686 (Vo1/Vo2 =2.5V/1.8V); Vin =24V Typical Characteristics Efficiency vs Io1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo1 vs Io2 @Io1 =1A Cross Regulation: Vo2 vs Io1 @Io2 =1A Efficiency vs Io1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) PT4686— 24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 100 0 3 6 9 12 15 I1 out (A ) Efficiency - % I2 out 2.48 2.49 2.5 2.51 2.52 0369 1 2 1 5 I2 out (A) V1 out (V) 0 3 6 9 12 15 I1 out (A ) Pd - Watts I2 out 1.78 1.79 1.8 1.81 1.82 0369 1 2 1 5 I1 out (A) V2 out (V) 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com Efficiency vs Io 1; Io2 @1A, 3A, and 6A Power Dissipation vs Io 1 and Io2 Cross Regulation: Vo 1 vs Io2 @Io1 =1A Cross Regulation: Vo 2 vs Io1 @Io2 =1A Efficiency vs Io 1; Io2 @9A, 12A, and 15A Safe Operating Area: (Io 1 + Io2) Typical Characteristics PT4687 (Vo1/Vo2 =5V/1.8V); Vin =24V Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typ ical data for the converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating t emperatures. PT4687— 24V 20-A 24-V Input Dual Output Isolated DC/DC Converter 100 0 3 6 9 12 15 I1 out (A ) Efficiency - % I2 out 1.78 1.79 1.8 1.81 1.82 0369 1 2 1 5 I1 out (A) V2 out (V) 0 3 6 9 12 15 I1 out (A ) Pd - Watts I2 out 4.95 4.975 5.025 5.05 0369 1 2 1 5 I2 out (A) V1 out (V) 100 0369 1 2 1 5 I1 out (A ) Efficiency - % I2 out 5 8 11 14 17 20 Io1 + Io2 (A) Ambient Temperature (°C) 300LFM 200LFM 100LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com PT4660 & PT4680 Series Operating Features & System Considerations for the PT4660/PT4680 Dual-Output DC/DC Converters Over-Current Protection The dual-outputs of the PT4660 and PT4680 series of DC/DC converters have independent output voltage regulation and current limit control. Applying a load current in excess of the current limit threshold at either output will cause the respective output voltage to drop. However, the voltage at Vo 2 is derived from Vo1. There- fore a current limit fault on Vo 1 will also cause Vo 2 to drop. Conversely, a current limit fault applied to Vo 2 will only cause Vo2 voltage to drop, and Vo 1 will remain in regulation. The current limit circuitry incorporates a limited amount of foldback. The fault current flowing into an absolute short circuit is therefore slightly less than the current limit threshold. Recovery from a current limit fault is automatic and the converter will not be damaged by a continuous short circuit at either output. Output Over-Voltage Protection Each output is monitored for over voltage (OV). For fail safe operation and redundancy, the OV fault detection circuitry uses a separate reference to the voltage regulation circuits. The OV threshold is fixed, and set nominally 25% higher than the set-point output voltage. If either output exceeds the threshold, the converter is shutdown and must be actively reset. The OV protection circuit can be reset by momentarily turning the converter off. This is accomplished by either cycling one of the output enable control pins (EN1 or EN2), or by removing the input power to the converter. Note: If Vo1 or Vo2 is adjusted to a higher voltage, the margin between the respective steady-state output voltage and its OV threshold is reduced. This can make the module sensitive to OV fault detection, that may result from random noise and load transients. Over-Temperature Protection The PT4660/80 DC/DC converters have an internal temperature sensor, which monitors the temperature of the module’s metal case. If the case temperature exceeds a nominal 115°C the converter will shut down. The converter will automatically restart when the sensed temperature returns to about 100°C. The analog voltage generated by the sensor is also made available at the ‘TEMP’ output (pin 5), and can be monitored by the host system for diagnostic purposes. Consult the ‘Pin Descrip- tions’ section of the data sheet for further information on this feature. Under-Voltage Lock-Out The Under-Voltage Lock-Out (UVLO) circuit prevents operation of the converter whenever the input voltage to the module is insufficient to maintain output regulation. The UVLO has approximately 2V of hysterisis. This is to prevent oscillation with a slowly changing input voltage. Below the UVLO threshold the module is off and the enable control inputs, EN1 and EN2 are inoperative. Primary-Secondary Isolation The PT4460/80 series of DC/DC converters incorporate electrical isolation between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500VDC. The isolation complies with UL60950 and EN60950, and the requirements for operational isolation. This allows the converter to be configured for either a positive or negative input voltage source. The regulation control circuitry for these modules is located on the secondary (output) side of the isolation barrier. Control signals are passed between the primary and secondary sides of the converter via a proprietory magnetic coupling scheme. This eliminates the use of opto-couplers. The data sheet ‘Pin Descriptions’ and ‘Pin-Out Information’ provides guidance as to which reference (primary or secondary) that must be used for each of the external control signals. Fuse Recommendations If desired an input fuse may be added to protect against the application of a reverse input voltage.

For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltage of the PT4660 and PT4680 Dual Output Voltage DC/DC Converters The output voltages Vo 1 and Vo2 from the PT4680 (24V Bus) and PT4660 (48V Bus) series of DC/DC converters can be independantly adjusted higher or lower than the factory trimmed pre-set voltage by up to ±10%. The adjustment requires the addition of a single external resistor 1. Table 1 gives the adjustment range of Vo1 and Vo2 for each model in the series as V a(min) and Va(max). Vo1 Adjust Down: Add a resistor (R1), between pin 13 (V1 Adj) and pin 12 (Vo1) 2. Vo1 Adjust Up: To increase the output, add a resistor R2 between pin 13 (V1 Adj) and pin 14 (COM) 2, 4. Vo2 Adjust Down: Add a resistor (R3) between pin 20 (V2 Adj) and pin 21 (Vo2) 2. Vo2 Adjust Up: Add a resistor R4 between pin 20 (V2 Adj) and pins 19 (COM) 2, 4. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. Notes: 1. Adjust resistors are not required if Vo 1 and Vo2 are to remain at their respective nominal set-point voltage. In this case, V1 Adj (pin 13) and V 2 Adj (pin 20) are left open-circuit 2. Use only a single 1% resistor in either the (R1) or R2 location to adjust Vo1, and in the (R3) or R4 location to adjust Vo2. Place the resistor as close to the DC/ DC/DC converter as possible. Figure 1 3. Vo2 must always be at least 0.3V lower than Vo 1. 4. The over-voltage protection threshold is fixed, and is set nominally 25% above the set-point output voltage. Adjusting Vo1 or Vo2 higher will reduce the voltage margin between the respective steady-state output voltage and its over-voltage (OV) protection threshold. This could make the module sensitive to OV fault detection, as a result of random noise and load transients. Note: An OV fault is a latched condition that shuts down both outputs of the converter. The fault can only be cleared by cycling one of the Enable control pins (EN 1* / EN2), or by momentarily removing the input power to the module. 5. Never connect capacitors to either the Vo 1 Adjust or Vo2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from Table 1 for the out- put and model being adjusted. (R1) or (R3) = Ko (Va – Vr ) – Rs kΩ Vr (Vo – Va) R2 or R4 = Ko – Rs kΩ Va – Vo Where: Vo = Original output voltage, (Vo1 or Vo2) Va = Adjusted output voltage Vr = The reference voltage from Table 1 Ko = The multiplier constant in Table 1 Rs = The series resistance from Table 1 PT4660 & PT4680 Series PT4660/80 +Vin EN 1* EN 2 –Vin Vo 1 adj Vo 2 adj Vo 1 Vo 2 COM 9 – 12 21 – 24 14 – 19 L O A D L O A D Vo 1 Vo 2 +V IN – V IN COM * Inverted logic (R1) (R3)

For technical support and more information, see inside back cover or visit www.ti.com Application Notes continued 5.5 5.0k Ω 5.4 11.2k Ω 5.3 21.6k Ω 5.2 42.4k Ω 5.1 105.0k Ω 5.0 4.9 (99.8)kΩ 4.8 (37.4)kΩ 4.7 (16.6)kΩ 4.6 (6.2)kΩ 4.5 (0.0) R1/R3 = (Blue), R2/R4 = Black Table 2A; ADJUSTMENT RESISTOR VALUES, Vo 1 24V Bus Pt.# PT4681/7 PT4682/3/5 PT4688 PT4686 48V Bus Pt.# PT4661/7 PT4662/3/5 PT4668 PT4666 Adj. Resistor (R1)/R2 (R1)/R2 (R1)/R2 (R1)/R2 Vo(nom) 5.0V 3.3V 3.3V 2.5V Va(req’d) V a(req’d) V a(req’d) Table 1; ADJUSTMENT RANGE AND FORMULA PARAMETERS Vo1 Bus Vo 2 Bus (2) 24V Bus Pt.# PT4681/7 PT4682/3/5 PT4688 PT4686 PT4681 PT4682 PT4683/6/7 PT4685 PT4688 48V Bus Pt.# PT4661/7 PT4662/3/5 PT4668 PT4666 PT4661 PT4662 PT4663/6/7 PT4665 PT4668 Adj. Resistor (R1)/R2 (R1)/R2 (R1)/R2 (R1)/R2 (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 PT4660 & PT4680 Series 3.6 7.4k Ω 31.5kΩ 3.54 14.3k Ω 40.7kΩ 3.48 25.7k Ω 55.9kΩ 3.42 48.6k Ω 86.3kΩ 3.36 117.0k Ω 178.0kΩ 3.3 1.95 9.4k Ω 1.9 15.7k Ω 1.85 34.7k Ω 1.8 1.75 (3.0)kΩ 1.7

1.65 TBD

1.6 TBD

1.55 TBD

1.5 1.45 (TBD) 1.4 (TBD) 1.35 (TBD) 1.3 3.0k Ω 1.275 5.5k Ω 1.25 10.3k Ω 1.225 24.8k Ω 1.2 1.175 (23.6)kΩ 1.15 (9.1)kΩ 1.125 (4.3)kΩ 1.1 (1.8)kΩ Table 2B; ADJUSTMENT RESISTOR VALUES, Vo 2 24V Bus Pt.# PT4681 PT4682 PT4683/6/7 PT4685 PT4688 48V Bus Pt.# PT4661 PT4662 PT4663/6/7 PT4665 PT4668 Adj. Resistor (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 (R3)/R4 Va(req’d) V a(req’d) 3.6 1.0k Ω 3.54 2.5k Ω 3.48 5.0k Ω 3.42 10.0k Ω 3.36 25.0k Ω 3.3 3.24 (29.8)kΩ 3.18 (11.8)kΩ 3.12 (5.8)kΩ 3.06 (2.8)kΩ 3.0 (1.0)kΩ 2.75 4.7k Ω 2.7 6.7k Ω 2.65 10.0k Ω 2.6 16.7k Ω 2.55 36.7k Ω 2.5 2.45 (22.0)kΩ 2.4 (8.7)kΩ 2.35 (4.2)kΩ 2.3 (2.0)kΩ 2.25 (0.7)kΩ R1/R3 = (Blue), R2/R4 = Black 2.75 5.0k Ω 2.7 11.2k Ω 2.65 21.6k Ω 2.6 42.4k Ω 2.55 105.0k Ω 2.5 2.45 (99.8kΩ ) 2.4 (37.4kΩ ) 2.35 (16.6kΩ ) 2.3 (6.2kΩ ) 2.25 (0.0kΩ )

www.ti.com 28-Aug-2012 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) PT4681A NRND SIP MODULE EKA 26 6 TBD Call TI Level-1-215C-UNLIM PT4682A NRND SIP MODULE EKA 26 6 TBD Call TI Level-1-215C-UNLIM PT4685C OBSOLETE SIP MODULE EKC 26 TBD Call TI Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

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