PTB48500 | DigiCamel IC Datasheet

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Document overview

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PDF pages: 14

Technical content

Features

Dual Outputs (Independently Regulated)
Input Voltage Range:

36 V to 75 V

Power-up/Down Sequencing
1500 VDC Isolation
Over-Current Protection
Over-T emperature Shutdown
Under-Voltage Lockout
Fixed Frequency Operation
T emp Range: –40 to 100 °C
Industry Standard Outline
Operates with PTB4851x for Complete AC7 Power Solution
Powers up to 64 DSL Ports
Safety Approvals: UL/cUL 60950 EN 60950

Description

The PTB4850x power modules are a dual-output isolated DC/DC converter, designed to provide the logic supply volt- ages for AC-7 based xDSL applications. The PTB48500 is rated for 13 A of total output current, making it suitable for 32-channel xDSL applications. The PTB48501 and PTB48502 provide output current for powering up to 64 xDSL chan- nels. The PTB48501 is rated for 16.5 A total output current, and the PTB48502, 21 A. The PTB48502 incorporates 10 W of additional capacity for powering periph- eral circuitry. Any of these converters can be used for other applications with simi- lar power requirements. The modules operate from a standard telecom (-48 V) central office (CO) supply and include an “on/off” enable control, output current limit, over-temperature protection, input under-voltage lockout (UVLO). The PTB48500 and PTB48501 also incorporates a power-up reset (POR) output. The modules are designed to operate with one of the PTB4851x DC/DC con- verter m odules. The combination of a PTB4850x and PTB4851x converter provides the complete the power supply for an AC7 chipset. The “EN Out” and “Sync Out” pins provide compatible out- put signals for controlling both the power up sequence and switching fr equency of the PTB48510. The PTB4850x modules employ double-sided surface mount construction, and are an industry standard size. PTB4850x +V I Enable –VI Vo 1 Vo 2 COM 7, (8) * L O A D L O A D Vo 1 Vo 2 +V I –V I COM Sync Out EN Out Vo2 Adj (8) *POR * Pin 8 is ‘COM’ on PTB48502 PTB48500, PTB48501, PTB48502 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com

Ordering Information

Code Description Pkg Ref. (1) AH Horiz. T/H (ERH) AS SMD, Standard (2) (ERJ) Output Voltage (PTB4850x❒xx) Code V oltage A 3.3 V / 1.2 V Notes: (1) Reference the applicable package reference drawing for the dimensions and PC board layout (2) “Standard” option specifies 63/37, Sn/Pb pin solder material. Pin Descriptions +VI: The positive input supply for the module with respect to –Vin. When powering the module from a –48 V telecom central office supply, this input is connected to the primary system ground. I: The negative input supply for the module, and the

0 VDC reference for the ‘Enable’ , ‘EN Out’ , and ‘Sync

Out’ signals. When the module is powered from a +48-V supply, this input is connected to the 48-V Return. VO 1: The higher regulated power output voltage, which is referenced to the COM node. V0 2: The lower regulated power 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 2 Adjust: Using a single resistor, this pin allows Vo 2 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Enable: This is an open-collector (open-drain) positive logic input that enables the module output. This pin is referenced to -Vin. A logic ‘0’ at this pin disables the module’s outputs, and a high impedance enables the out- puts. If not used the pin should be left unconnected. EN Out: This open-collector output may be used to enable the output of other DC/DC converters in applications where the power-up sequence of the related voltages must be precisely controlled. The output is used principally to control the startup up of a PTB4851xx module when powering ADSL circuits based on the AC7 chipset. The signal is referenced to -Vin, and is active low. It is initially ‘off’ (high impedance), and turns ‘on’ when the output voltage, Vo 1, has risen to its nominal set-point voltage. Sync Out: The signal generated by this pin is designed to be used exclusively with the PTB48510 in AC7 ADSL applications. When the ‘ Sync Out ’ of this converter is connected directly to the ‘ Sync In’ pin of the PTB48510, both modules will operate at the same switch conversion frequency. POR*: (Available to PTB48500 and PTB48501 only!) This pin pr oduces an active-low power-on reset signal that may be used to reset logic circuitry. The output is set low during power up just as the output voltage from Vo 1 starts to rise. It remains low for 10 ms after the volt- age at Vo1 has reached its nominal set-point voltage. This signal is referenced to the COM node, and has a 3.3-kΩ internal pull-up resistor to Vo Environmental and General Specifications (Unless otherwise stated, all voltages are with respect to –V in) Characteristics Symbols Conditions Min Typ Max Units Input Voltage Range V in Over output load range 36 48 75 VDC Isolation Voltage Input–output/input–case 1500 — — V Capacitance Input to output — 1500 — pF Resistance Input to output 10 — — M Ω Operating T emperature Range T a Over Vin Range –40 — +85 °C Over-T emperature Protection OTP Shutdown threshold — 115 — °CHysterisis — 10 — Solder Reflow T emperature T reflow Surface temperature of module body or pins 235 (i) °C Storage T emperature T s — –40 — 125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 — 500 — G’s1 msec, ½ Sine, mounted Mechanical Vibration Mil-STD-883D, Method 2007.2 Suffix H — 20 — G’s20-2000 Hz Suffix C — 5 — Weight — — 20 — grams Flammability — Meets UL 94V-O Notes: (i) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the st ated maximum. Base Part No. (PTB4850❒xxx) Order Prefix Description PTB48500xxx 13 A (32-Ports) PTB48501xxx 16.5 A (48/64-Ports) PTB48502xx 21 A (64-Ports + 10 W) Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL PTB48500, PTB48501, PTB48502 SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com PTB48500 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL Specifications (Unless otherwise stated, T A =25°C, VI =48 V, CI =0µF, CO =0 µF, and IO =50% Iomax) PTB48500A Characteristic Symbol Conditions Min Typ Max Units Output Power Po 1, Po2 Vo1 (3.3 V) — — 19.8 WVo2 (1.2 V) — — 8.4 Po total Both outputs — — 28 W Output Current Io 1, Io2 Over VI range V o 1 (3.3 V) 0 — 6 (1) AVo2 (1.2 V) 0 — 7 (1) Io1 + Io2 T otal (both outputs) 0 — 13 A T emperature Variation ∆Regtemp –40° ≤TA ≤ +85°C, IO =IO min Vo 1 — ±0.5 — %VoVo2 — ±0.8 — Line Regulation ∆Regline Over VI range Vo 1, Vo2 — ±1 ±10 mV Load Regulation ∆Regload Over IO range Vo 1, Vo2 — ±3 ±12 mV Cross Regulation ∆Regcross IO min ≤ Io2 ≤ Iomax, Io1 =1 A ∆Vo1 ——1 0 mVIO min ≤ Io1 ≤ Iomax, Io2 =1 A ∆Vo2 ——1 0 Efficiency η Io1, Io2 =Iomax — 82 — % Vo Ripple (pk-pk) V r 20 MHz bandwidth Vo 1 —2 05 0 mVppVo2 —2 05 0 T ransient Response t tr 1 A/µs load step, 50% to 100% Iomax — 30 — µs ∆Vtr Vo1, Vo2 over/undershoot — ±2.0 — %V o Over Current Threshold I otrip V I =36 V , Io1 + Io2 13.5 16 — Areset followed by auto-recovery Output Voltage Adjust Range Vadj V o 2 only -10 — +20 %V o Switching Frequency ƒ s Over VI and IO ranges 500 550 600 kHz Under-Voltage Lockout V I on V I increasing — 34 — VVI off V I decreasing — 32 — On/Off Enable (pin 3) Referenced to –V I (pin 5) Input High Voltage V IH +3.6 — +75 (2) V Input Low Voltage V IL –0.2 — +0.8 Input Low Current I IL —– 1—m A Standby Input Current I I standby pins 3 & 5 connected — 2 — mA Internal Input Capacitance C I —2 —µ F External Output Capacitance Co 1 0 (3) — 5,000 µFCo2 0 (3) — 5,000 Reliability MTBF Per T elcordia SR-332 1.5 — — 10 6 Hrs50% stress, TA =40°C, ground benign Notes: (1) See Safe Operating Area curves or contact the factory for the appropriate derating. (2) The On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor . T he input is diode protected and may be connected to +V I. The maximum open-circuit voltage is 7 V . If it is left open circuit the converter will operate when input power is applied. (3) An output capacitor is not required. SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the converter. Note B: Load current is increased proportionally from both outputs, up to the respective maximum value of each output. Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. × 4 in. double-sided PCB with 1 oz. copper. Typical Characteristics PTB48500A Characteristic Data (See Note A) Efficiency vs Load Current (See Note B) Power Dissipation vs Load Current (See Note B) Safe Operating Area PTB48500A (See Note C) VIN =48 VDC (See Note B) Cross Regulation, ∆∆∆∆∆ Vox vs Ioy @Iox =1 A & VIN =48 V 0 5 10 15 20 25 30 Total Output Power (W) Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat Conv Airflow 100 02468 1 0 1 2 Io1 + Io2 (A) Efficiency - % 48 V 36 V 75 V VIN 02468 1 0 1 2 Io1 + Io2 (A) Pd - Watts 48 V 36 V 75 V VIN PTB48500 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL 01234567 Io1 : Io2 (A) Cross Regulation ∆Vo (mV) Vo 1 vs Io2 Vo 2 vs Io1 SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com PTB48501 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL Specifications (Unless otherwise stated, T A =25°C, VI =48 V , CI =0 µF , CO =0 µF, and Io =50% IO max) PTB48501A Characteristic Symbol Conditions Min Typ Max Units Output Power Po 1, Po2 Vo1 (3.3 V) — — 19.8 WVo2 (1.2 V) — — 12.6 Po total Both outputs — — 32.4 W Output Current Io 1, Io2 Over VI range V o 1 (3.3 V) 0 — 6 (1) AVo2 (1.2 V) 0 — 10.5 (1) Io1 + Io2 T otal (both outputs) 0 — 16.5 A T emperature Variation ∆Regtemp –40° ≤TA ≤ +85°C, IO =IO min Vo 1 — ±0.5 — %VoVo2 — ±0.8 — Line Regulation ∆Regline Over VI range Vo 1, Vo2 — ±1 ±10 mV Load Regulation ∆Regload Over Io range Vo 1, Vo2 — ±3 ±12 mV Cross Regulation ∆Regcross IO min ≤ Io2 ≤ Iomax, Io1 =1 A ∆Vo1 ——1 0 mVIO min ≤ Io1 ≤ Iomax, Io2 =1 A ∆Vo2 ——1 0 Efficiency η Io1, Io2 =Iomax — 81 — % Vo Ripple (pk-pk) V r 20 MHz bandwidth Vo 1 —2 05 0 mVppVo2 —2 05 0 T ransient Response t tr 1 A/µs load step, 50% to 100% Iomax — 30 — µs ∆Vtr Vo1, Vo2 over/undershoot — ±2.0 — %V o Over Current Threshold I O trip V I =36V , Io1 + Io2 —2 4—Areset followed by auto-recovery Output Voltage Adjust Range Vadj V o 2 only –20 — +10 %V o Switching Frequency ƒ s Over VI and IO ranges 500 550 600 kHz Under-Voltage Lockout V I on V I increasing — 34 — VVI off V I decreasing — 32 — On/Off Enable (pin 3) Referenced to –V I (pin 5) Input High Voltage V IH +3.6 — +75 (2) V Input Low Voltage V IL –0.2 — +0.8 Input Low Current I IL —– 1—m A Standby Input Current I I standby pins 3 & 5 connected — 2 — mA Internal Input Capacitance C I —2 —µ F External Output Capacitance Co 1 0 (3) — 5,000 µFCo2 0 (3) — 5,000 Reliability MTBF Per T elcordia SR-332 1.5 — — 10 6 Hrs50% stress, TA =40°C, ground benign Notes: (1) See Safe Operating Area curves or contact the factory for the appropriate derating. (2) The On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor . T he input is diode protected and may be connected to +V I. The maximum open-circuit voltage is 7 V . If it is left open circuit the converter will operate when input power is applied. (3) An output capacitor is not required. SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the converter. Note B: Load current is increased proportionally from both outputs, up to the respective maximum value of each output. Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. × 4 in. double-sided PCB with 1 oz. copper. Typical Characteristics PTB48501A Characteristic Data (See Note A) Efficiency vs Load Current (See Note B) Power Dissipation vs Load Current (See Note B) Safe Operating Area PTB48501A (See Note C) VIN =48 VDC (See Note B) Cross Regulation, ∆∆∆∆∆ Vox vs Ioy @Iox =1 A & VIN =48 V PTB48501 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL 0 8 16 24 32 Output Power (W) Ambient Temperature (°C) 400LFM 200LFM 100LFM Nat conv Airflow 100 0369 1 2 1 5 1 8 Io1 + Io2 (A) Efficiency - % 36 V 48 V 75 V VIN 0369 1 2 1 5 1 8 Io1 + Io2 (A) Pd - Watts 48 V 36 V 75 V SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004 02468 1 0 1 2 Io1 : Io2 (A) Cross Regulation VO (mV) Vo 1 vs Io2 Vo 2 vs Io1

For technical support and further information visit http://power.ti.com PTB48502 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL Specifications (Unless otherwise stated, T A =25°C, VI =48 V, CI =0 µF , CO =0 µF , and IO =50% IO max) PTB48502A Characteristic Symbol Conditions Min Typ Max Units Output Power Po 1, Po2 Vo1 (3.3 V) — — 33 WVo2 (1.2 V) — — 15.6 Po total Both outputs — — 45 W Output Current Io 1, Io2 Over Vin range V o 1 (3.3 V) 0 — 10 (1) AVo2 (1.2 V) 0 — 13 (1) Io1 + Io2 T otal (both outputs) 0 — 21 A T emperature Variation ∆Regtemp –40° ≤TA ≤ +85°C, Io =Iomin Vo 1 — ±0.5 — %VoVo2 — ±0.8 — Line Regulation ∆Regline Over VI range Vo 1, Vo2 — ±1 ±10 mV Load Regulation ∆Regload Over IO range Vo 1, Vo2 — ±3 ±12 mV Cross Regulation ∆Regcross IO min ≤ Io2 ≤ Iomax, Io1 =1 A ∆Vo1 ——1 0 mVIO min ≤ Io1 ≤ Iomax, Io2 =1 A ∆Vo2 ——1 0 Efficiency η Io1, Io2 =Iomax — 82 — % Vo Ripple (pk-pk) V r 20 MHz bandwidth Vo 1 —2 05 0 mVppVo2 —2 05 0 T ransient Response t tr 1 A/µs load step, 50% to 100% Iomax — 30 — µs ∆Vtr Vo1, Vo2 over/undershoot — ±2.0 — %V o Over Current Threshold I otrip V I =36V , Io1 + Io2 —2 4—Areset followed by auto-recovery Output Voltage Adjust Range Vadj V o 2 only –20 — +10 %V o Switching Frequency ƒ s Over VI and Io ranges 500 550 600 kHz Under-Voltage Lockout V I on V I increasing — 34 — VVI off V I decreasing — 32 — On/Off Enable (pin 3) Referenced to –V I (pin 5) Input High Voltage V IH +3.6 — +75 (2) V Input Low Voltage V IL –0.2 — +0.8 Input Low Current I IL —– 1—m A Standby Input Current I I standby pins 3 & 5 connected — 2 — mA Internal Input Capacitance C I —2 —µ F External Output Capacitance Co 1 0 (3) — 5,000 µFCo2 0 (3) — 5,000 Reliability MTBF Per T elcordia SR-332 1.5 — — 10 6 Hrs50% stress, TA =40°C, ground benign Notes: (1) See Safe Operating Area curves or contact the factory for the appropriate derating. (2) The On/Off Enable (pin 3) has an internal pull-up and may be controlled with an open-collector (or open-drain) transistor . T he input is diode protected and may be connected to +V I. The maximum open-circuit voltage is 7 V . If it is left open circuit the converter will operate when input power is applied. (3) An output capacitor is not required. SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004

For technical support and further information visit http://power.ti.com Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the converter. Note B: Load current is increased proportionally from both outputs, up to the indicated maximum value of each respective output. Note C: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. × 4 in. double-sided PCB with 1 oz. copper. Typical Characteristics PTB48502A Characteristic Data (See Note A) [Io1 =10 A, Io2 =10 A represents 100% load] Efficiency vs Load Current (See Note B) Power Dissipation vs Load Current (See Note B) Safe Operating Area, V IN =48 V (See Notes B, C) PTB48502 Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL SL TS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Output Load – % Ambient Temperature – °C 400LFM 200LFM 100LFM Nat conv Airflow 0 1 02 03 04 05 06 07 08 09 0 1 0 0 Output Load – % Ambient Temperature – °C 400LFM 200LFM 100LFM Nat conv Airflow Safe Operating Area, V IN =48 V (See Notes B, C) Efficiency vs Load Current (See Note B) Power Dissipation vs Load Current (See Note B) PTB48502A Characteristic Data (See Note A) [Io1 =8 A, Io2 =13 A represents 100% load] 100 0 2 04 06 08 0 1 0 0 Output Load – % Efficiency - % 36 V 48 V 75 V VI 0 2 04 06 08 0 1 0 0 Output Load – % Power Dissipation – W 75 V 48 V 36 V VI 100 0 2 04 06 08 0 1 0 0 Output Load – % Efficiency - % 36 V 48 V 75 V VI 0 2 04 06 08 0 1 0 0 Output Load – % Power Dissipation – W 75 V 48 V 36 V V I 02468 1 0 1 2 Io1 : Io2 – (A) Cross Regulation VO – (mV) Vo 1 vs Io2 Vo 2 vs Io1 Cross Regulation, ∆ Vx vs. ∆ Vy @Iox =1 A & VI =48 V Cross Regulation, ∆ Vx vs. ∆ Vy @Iox =1 A & VI =48 V 02468 1 0 Io1 : Io2 – (A) Cross Regulation VO – (mV) Vo 1 vs Io2 Vo 2 vs Io1

For technical support and further information visit http://power.ti.com Adjusting the Lower Output Voltage of the PTB4850x Series of DC/DC Converters The PTB4850x series of DC/DC converters are de- signed to produce two logic-level supply voltages for use with the AC-7 ADSL chipset. The magnitude of lowest output voltage (Vo 2) can be adjusted higher or lower by up to +10% or –20% of the nominal. The adjust- ment method uses a single external resistor. 1 The value of the resistor determines the amount of adjustment, and its placement determines whether the voltage is increased or decreased. The resistor values can be calcu- lated using the appropriate formula (see below), or simply selected from the range of values given in T able 1-2. The placement of each resistor is as follows. Adjust Up: T o increase the magnitude of both output volt- ages, place a resistor R 1 between Vo2 Adj (pin 9) and the Vo2 (pin 6) voltage rail; see Figure 1-1(a). Figure 1-1b PTB48500, PTB48501, & PTB48502 Calculation of Resistor Adjust Values The value of the adjust resistor is calculated using one of the following equations. Use the equation for R 1 to adjust up, or (R2) to adjust down. R1 [Adjust Up] = R p · Va – Rs kΩ(Va – Vo ) (R2) [Adj Down] = R n · Va – Rs kΩ (Vo – Va ) Where: V o = Magitude of the original output voltage Va = Magnitude of the adjusted voltage Rp = Adjust-up constant from T able 1-1 Rn = Adjust-down constant from T able 1-1 Rs = Internal series resistor from T able 1-1Figure 1-1a Adjust Down: T o decrease the magnitude of both output voltages, add a resistor (R2), between Vo2 Adj (pin 9) and the COM (pin 7) voltage rail; see Figure 1-1(b). Notes: 1. A 0.05 W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C or better. Place the resistor in either the R 1 or (R2) location, as close to the converter as possible. 2. Never connect capacitors to the Vo2 Adj pin. Capacitance added to this pin can affect the stability of the regulated output. Adjust Up Vo2 Vo2 Adj +VO PTB4850x COM 7 (R2) Adj Down Vo2 Vo2 Adj +VO PTB4850x COM 7 Table 1-1 ADJUSTMENT RANGE AND FORMULA PARAMETERS Part No. PTB48500(1)A PTB48502A Vo(nom) 1.2 V 1.2 V Va(min) 0.96 V 0.84 V Va(max) 1.32 V 1.32 V Rp (kΩΩΩΩΩ ) 1.648 1.196 Rn (kΩΩΩΩΩ ) 4.624 3.598 Rs (kΩΩΩΩΩ ) 18.2 13.0

Application Notes continued For technical support and further information visit http://power.ti.com Table 1-2 ADJUST RESISTOR VALUES Part No. PTB4850xA PTB48502A % Adjust V a (V) R 1 / (R2) R1 / (R2) – 3 1.164 (131) kΩ (103.0) kΩ – 2 1.176 (208) kΩ (163.0) kΩ – 1 1.188 (440) kΩ (343.0) kΩ 0 1.200 + 1 1.212 148 k Ω 108.0 kΩ + 2 1.224 65.8 k Ω 48.0 kΩ + 3 1.236 38.4 k Ω 28.1 kΩ + 4 1.248 24.6 k Ω 18.1 kΩ + 5 1.260 16.4 k Ω 12.1 kΩ + 6 1.272 10.9 k Ω 8.1 kΩ + 7 1.284 7 k Ω 5.3 kΩ + 8 1.296 4.1 k Ω 3.2 kΩ + 9 1.308 1.8 k Ω 1.5 kΩ +10 1.320 0 k Ω 0.2 kΩ R1 =Adjust up, (R2) =Adjust down PTB48500, PTB48501, & PTB48502

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Product Information

PTB48500 specifications and overview.

Summary

Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL

Description

Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL

Source title PTB48500 Datasheet(PDF) - Texas Instruments

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