PT6644 TI | Alldatasheet

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Technical content

For technical support and more information, see inside back cover or visit www.ti.com/powertrends

  • Wide Input V oltage Range: +8V to +25V
  • Negative Output: –2.5V/4A to –15V/1.5A
  • Adjustable Output V oltage
  • 85% Efficiency
  • Remote Sense Capability 24W 12V Input P ositive to Negative Voltage Converter PT6640 Series Standard Application C 1 = Required 560µF electrolytic C 2 = Required 330µF electrolytic PT6640 4,5,6 7,8,9,10 11,12,13 VIN COM COM -VOUT C2C1 + 1 REMOTE SENSE LOAD+

Ordering Information

PT6641 = –3.3 Volts PT6642 = –5.0 Volts PT6643 = –12.0 Volts PT6644 = –9.0 V olts PT6645 = –15.0 V olts PT6646 = –2.5 Volts PT Series Suffix (PT1234X) Case/Pin Heat Configuration Spreader V ertical Through-Hole P Horizontal Through-Hole D Horizontal Surface Mount E

1 Remote Sense

2 Do Not Connect

3 Do Not Connect

7 –Vout 8 –Vout 9 –Vout 10 –Vout

11 GND

12 GND

13 GND

14 V out Adjust

The PT6640 series is a positive input to negative output line of Integrated Switching Regulators (ISRs). Designed for general purpose applications, the PT6640 series deliv- ers a negative output voltage at up to 24W. The PT6640 is packaged in a 14-Pin SIP (Single In-line Package) and is available in a surface-mount configuration. Note: Back surface of product is conducting metal Pkg Style 400 SLTS037A (Revised 6/30/2000) PT6640 Specifications Characteristics PT6640 SERIES (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Ta = 60°C, 200 LFM, pkg P 0.1 — (See Note 2) Ta = 25°C, natural convection V o≤ – 5.0V 0.1 — 4.0 Input V oltage Range V in 0.1A ≤ Io ≤ Io max V o = –2.5V/3.3V +8 — +27 Output V oltage T olerance ∆ Vo Over Vin range Ta = -40°C to +65°C Vo-0.1 — V o+0.1 V Output Voltage Adjust Range V oadj Pin 14 to Vo or ground V o = – 2.5V –1.8 — –4.3 Line Regulation Reg line +9V≤ Vin≤ +Vinmax, Io = Iomax — ±0.5 ±1.0 %V o Load Regulation Reg load Vin = +12V , 0.1≤ Io≤ Iomax — ±0.5 ±1.0 %V o Vo Ripple/Noise V n Vin = +12V , Io = Iomax — 3.0 — %V o T ransient Response t tr Io step between 0.5xIomax and Iomax — 200 — µSec with C 2 = 330µF V os Vo over/undershoot — 100 — mV Efficiency η Vin = +12V , Io = 0.5x Iomax V o = – 2.5V — 75 — Vo = – 3.3V — 79 — Vo = –15.0V — 84 — Vin = +12V , Io = Iomax V o = – 2.5V — 74 — Continued

For technical support and more information, see inside back cover or visit www.ti.com/powertrends Specifications (continued) Characteristics PT6640 SERIES (Ta = 25°C unless noted) Symbols Conditions Min Typ Max Units Switching Frequency ƒ o +9V ≤ Vin ≤ Vinmax 500 550 600 kHzOver Io range Absolute Maximum T a Over Vin range -40 — +85 (2) °COperating T emperature Range Storage T emperature T s — -40 — +125 °C Mechanical Shock — Per Mil-STD-883D, Method 2002.3 — 500 — G’s Mechanical Vibration — Per Mil-STD-883D, Method 2007.2, — 7.5 — G’s20-2000 Hz, soldered in a PC board Weight — — — 14 — grams Notes: (1) The PT6640 Series requires a 330µF(output) and 560µF(input) electrolytic capacitors for proper operation in all applications. (2) See Safe Operating Area curves or call the factory for guidance on thermal derating. Efficiency vs Output Current Characteristic Curves @12.0V V in (See Note A) Safe Operating Area Curves (See Note B) Power Dissipation vs Output Current Ripple vs Output Current Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter. Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures. PT6642, @Vin =12V 24W 12V Input P ositive to Negative Voltage Converter PT6640 Series 60.0 65.0 70.0 75.0 80.0 85.0 90.0 00 . 511 . 522 . 533 . 54 Output Current (A) Efficiency (%) PT6643 PT6642 PT6641 PT6646 100 125 150 00 . 511 . 522 . 533 . 54 Output Current (A) Ripple (mV) PT6645 PT6643 PT6644 PT6642 PT6641 PT6646 00 . 511 . 522 . 533 . 54 Output Current (A) PDiss (Watts) PT6645 PT6643 PT6644 PT6642 PT6641 PT6646 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 Output Current (A) Ambient Temperature ( C) 200LFM 120LFM 60LFM Nat conv Airflow

For technical support and more information, see inside back cover or visit www.ti.com/powertrends PT6640 Series Adjusting the Output Voltage of the PT6640 24W Positive to Negative ISR Series The negative output voltage of the Power T rends PT6640 series ISRs may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. T able 1 gives the allowable ad- justment range for each model in the series as V a (min) and Va (max). Adjust Up: An increase in the negative output voltage is obtained by adding a resistor R2, between pin 14 (V o adjust) and pins 7-10 (-Vout). Adjust Down: Adding a resistor (R1), between pin 14 (Vo adjust) and pins 11-13 (GND), decreases the output voltage magnitude. Refer to Figure 1 and T able 2 for both the placement and value of the required resistor, either (R1) or R2 as appro- priate. Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo adjust to either GND, Vout, or the Remote Sense pin. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is being used, connecting the resistor (R1) between pin 14 (Vo adjust) and pin 1 (Remote Sense) can benefit load regulation. 4. The maximum allowed input voltage (Vin) will change as Vout is adjusted. The difference between the input voltage (Vin) and the output voltage (Vout) must not exceed 30V or 10 × Vout, whichever is less. Use one of the following formulas to determine the maximum allowed input voltage for the PT6640.  Vout greater than 2.73V , Vin(max) = 30 –  Vout Vdc For example, if Vout = -12V , Vin(max) = 30 –  -12 = 18Vdc  Vout less than 2.73V , Vin(max) = 10 ×  Vout Vdc The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. Ro (Vo – 1.25)(Va – 1.25)(R1) = 1.25 (Vo – Va) – Rs kΩ Ro (Vo – 1.25) – Rs kΩR2 = Va - Vo Where: Vo = Original Vout (magnitude) Va = Adjusted V out (magnitude) Ro = The resistance value in T able 1 Rs = The series resistance from T able 1 Figure 1 Table 1 PT6640 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # PT6646 PT6641 PT6642 PT6644 PT6643 PT6645 C in 560 µ F + C out 330 µ F+ (R1) |-V o | Down |-V o | Up V out COMCOM +V in L O A D PT6640 7,8,9,10 1411,12,13 4,5,6 +V in V out GND V o(adj)SNS(+)

Application Notes continued For technical support and more information, see inside back cover or visit www.ti.com/powertrends Table 2 PT6640 ADJUSTMENT RESISTOR VALUES Series Pt # PT6646 PT6641 PT6642 Series Pt # PT6644 PT6643 PT6645 Current 4Adc 4Adc 4Adc Current 2.5Adc 2Adc 1.5Adc Va (req’d) V a (req’d) –6.1 3.5k Ω –15.0 –6.2 2.8k Ω –15.5 42.3k Ω –6.3 2.2k Ω –16.0 14.8k Ω –6.4 1.7k Ω –16.5 5.6k Ω –6.5 1.2k Ω –17.0 1.1k Ω R1 = (Blue) R2 = Black PT6640 Series

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