PT6920 TI | Alldatasheet

Document overview

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Technical content

Features

  • Dual Outputs: +3.3V/6A +2.5V/2.2A or +1.8V/1.5A
  • Adjustable Output Voltage
  • Remote Sense (both outputs)
  • Standby Function
  • Over-T emperature Protection
  • Soft-Start
  • Internal Sequencing
  • 23-pin SIPPackage Pin Function 1V 1 Remote Sense

2 Do Not Connect

3 STBY

7 GND

8 GND

9 GND

10 GND

11 GND

12 V 1out

13 V 1out

14 V 1out

15 V 1out

16 V 1 Adjust

17 Do Not Connect

18 V 2out

19 V 2out

20 V 2out

21 V 2out

22 V 2 Remote Sense

23 V 2 Adjust*

The PT6920 is a new series of 25W dual output ISRs designed to power the latest generation DSP chips. Both out- put voltages are independently adjustable with external resistors. In addition, the second output voltage of the PT6921 can be selected for 2.5V or 1.8V to accom- modate the next generation of DSP chips. The internal power sequencing of both outputs meet the latest require- ments of TI’s ‘C6000 series DSPs. (For dimensions and PC board layout, see Package Styles 1100 and 1110.) PT6920 C2 + GND V1OUT VIN GND 4,5,6 7-11 12-15 18-21 C3 +23 V2OUT V2 Sense V1 Sense STBY PT Series Suffix (PT1234X) Case/Pin Configuration Vertical Through-Hole N Horizontal Through-Hole A Horizontal Surface Mount C Preliminary Specifications Characteristics PT6920 SERIES (Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units Output Current I o Ta = +60°C, 200 LFM, pkg N V 1 = 3.3V 0.1 — 5.5 A V2 = 2.5V 0 — 2.2 A V2 = 1.8V 0 — 1.75 A V2 = 1.2V 0 — 1.2 A Ta = +25°C, natural convection V1 = 3.3V 0.1 — 6.0 A V2 = 2.5V 0 — 2.2 A V2 = 1.8V 0 — 1.75 A V2 = 1.2V 0 — 1.2 A Input Voltage Range V in 0.1A ≤ Io ≤ Imax 4.5 — 5.5 V Output Voltage T olerance Δ Vo Vin = +5V , Io = Imax, both outputs Vo-0.1 — V o+0.1 V0°C ≤ Ta ≤ +65°C Line Regulation Reg line 4.5V ≤ Vin ≤ 5.5V , Io = Imax V1 = 3.3V — ±7 ±17 mV V2 = 2.5V — ±7 ±13 mV Load Regulation Reg load Vin = +5V , 0.1 ≤ Io ≤ Imax V1 = 3.3V — ±17 ±33 mV V2 = 2.5V — ±4 ±10 mV Vo Ripple/Noise V n Vin = +5V , Io = Imax V1 = 3.3V — 50 — mV V2 = 2.5V — 25 — mV T ransient Response t tr Io step between 0.5xI max and Imax — 25 — µSec with C2 = 330µF V os Vo over/undershoot V 1 = 3.3V — 60 — mV V2 = 2.5V — 60 — mV Efficiency η Vin = +5V , Io = 4A total — 75 — % Switching Frequency ƒ o 4.5V ≤ Vin ≤ 5.5V 475 600 725 kHz0.1A ≤ Io ≤ Imax Absolute Maximum T a — 0 — +85 °COperating T emperature Range Recommended Operating T a Forced airflow = 200 LFM 0 — +65 °CT emperature Range Over V in and Io Ranges Storage T emperature T s — -40 — +125 °C Weight — Vertical/Horizontal — 29 — grams Note: The PT6920 series requires a 560µF electrolytic capacitor on the input and a 330µF electrolytic capacitor on the output for proper operation in all applications. * This product is the subject of one or more patents. Other patents pending. Note: for PT6921 only: with pin 23 open, V2out=2.5V with pin 23 shorted to pin 22, V2out=1.8V Patent Pending* Revised 3/9/99 Application Notes Mechanical Outline Product Selector Guide

For assistance or to order, call (800) 531-5782 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com CHARACTERISTIC DATA PT6920 Series Note 1:Note 1:Note 1:Note 1:Note 1: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR. PT6921, V2out = 2.5V, I2out = 2.2A (See Note 1) Total Efficiency vs I1out Total Power Dissipation vs I1out Efficiency (%)PD (Watts) I1out (A) I1out (A) Vin Vin 0123456 Nat conv. 60LFM 200LFM I1out (A) Ta (°C) Safe Operating Area vs I1out Recommended Maximum Operating Temperature 100 0123456 4.5V 5.0V 5.5V V1out Ripple vs I1out Ripple (mV) I1out (A) 0123456 4. 5V 5. 0V 5. 5V 0123456 4.5V 5.0V 5.5V Vin

For assistance or to order, call (800) 531-5782 3Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com More Application Notes Adjusting the Output Voltage of the PT6920 Dual Output Voltage ISR Both output voltages from the Power Trends PT6920 series ISRs can be independantly adjusted higher or lower than their factory trimmed pre-set voltage. In each case only a single external resistor is required to adjust either V1 (the voltage at V1out, or V2 (the voltage at V2out). Table 1 gives the permis- sible adjustment range for both V1 and V2 for each model in the series as Va(min) and Va(max). Note: V2 must always be lower than V1. V1 Adjust Up: To increase the output, add a resistor R4 be- tween pin 16 (V1 Adjust) and pins 7-11 (GND). V1 Adjust Down: Add a resistor (R3), between pin 16 (V1 Adjust) and pin 1 (V1 Remote Sense). V2 Adjust Up: Add a resistor R2 between pin 23 (V2 Adjust) and pins 7-11 (GND). V2 Adjust Down: Add a resistor (R1) between pin 23 (V2 Adjust) and pin 22 (V2 Remote Sense). Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. Notes: 1. The voltage at V1out and V2out may be adjusted independantly. 2. V2 must always be at least 0.2V lower than V1. 3. If V1 is increased above 3.3V, the minimum input voltage to the ISR must also be increased. The minimum required input voltage must be (V1 + 1.2)V or 4.5V, whichever is greater. Do not exceed 6.0V 4. Use only a single 1% resistor in either the (R3) or R4 loca- Table 1 PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS Output Bus V1 out V2 out Series Pt # PT6921/22 PT6921 PT6922 Adj. Resistor (R3)/R4 (R1)/R2 (R1)/R2 Vo(nom) 3.3V 2.5V 1.5 Va(min) 2.3V 1.8V 1.2 Va(max) 4.2V 3.0V 3.0 Ro (kΩ ) 12.1 10.0 9.76 Rs (kΩ ) 12.1 11.5 6.49 Figure 1 330 µ F 330 µ F + C3 100 µ F (R3) (R1) L O A D L O A D Adj Down Adjust Up Vin COM COM V2 out V1 out PT6920 18 - 21 237 - 11 4,5,6 Vin V2 out GND Vo 2 (adj) V 1 (sns) Vo 1 (adj) 12 - 15V1 out V 2 (sns) STBY Adjust V1 out Adjust V2 out tion to adjust V1, and in the (R1) or R2 location to adjust V2. Place the resistor as close to the ISR as possible. 5. Never connect capacitors to either the V1 Adjust or V2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. 6. To comply with the ISRs power dissipation limits, changes made to either output voltage (V1 or V2) may affect the maximum current available from both outputs. For more information, consult the related applications note, “Deter- mining the Maximum Output Current for the PT6920 Series Dual Output ISR.” The adjust up and adjust down resistor values can also be calcu- lated using the following formulae. Be sure to select the correct formula parameter from Table 1 for the output and model being adjusted. (R1)/(R3) = Ro (Va – 1) – Rs kΩ Vo – Va R2/R4 = Ro – Rs kΩ Va – Vo Where: Vo = Original output voltage, (V1 or V2) Va = Adjusted output voltage Ro = The resistance value from Table 1 Rs = The series resistance from Table 1

For assistance or to order, call (800) 531-5782 Application Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com NotesPT6920 Series Table 2 PT6920 ADJUSTMENT RESISTOR VALUES Output Bus V1 out V2 out Series Pt # PT6921/22 PT6921 PT6922 Adj Resistor (R3)/R4 (R1)/R2 (R1)/R2 Vo(nom) 3.3Vdc 2.5Vdc 1.5Vdc Va(req’d) 1.2 (0.0)kΩ 1.25 (3.3)kΩ 1.3 (8.2)kΩ 1.35 (16.3)kΩ 1.4 (32.6)kΩ 1.45 (81.4)kΩ 1.5 1.55 189.0kΩ 1.6 91.1kΩ 1.65 58.6kΩ 1.7 42.3kΩ 1.75 32.6kΩ 1.8 (0.0)kΩ 26.0kΩ 1.9 (3.5)kΩ 17.9kΩ 2.0 (8.5)kΩ 13.0kΩ 2.05 (11.8)kΩ 11.3kΩ 2.1 (16.0)kΩ 9.8kΩ 2.2 (28.5)kΩ 7.5kΩ 2.5 (10.6)kΩ 3.3kΩ 2.55 (12.9)kΩ 189.0kΩ 2.8kΩ 2.6 (15.6)kΩ 88.5kΩ 2.4kΩ 2.65 (18.6)kΩ 55.2kΩ 2.0kΩ 2.7 (22.2)kΩ 38.5kΩ 1.6kΩ 2.75 (26.4)kΩ 28.5kΩ 1.3kΩ 2.8 (31.5)kΩ 21.8kΩ 1.0kΩ 2.85 (37.6)kΩ 17.1kΩ 0.7kΩ 2.9 (45.4)kΩ 13.5kΩ 0.5kΩ 2.95 (55.3)kΩ 10.7kΩ 0.2kΩ 3.0 (68.6)kΩ 8.5kΩ 0.0kΩ 3.05 (87.1)kΩ 3.1 (115.0)kΩ 3.15 (161.0)kΩ 3.2 (254.0)kΩ 3.25 (532.0)kΩ 3.3 3.4 109.0kΩ 3.5 48.4kΩ 3.6 28.2kΩ 3.7 18.2kΩ 3.8 12.1kΩ 3.9 8.1kΩ 4.0 5.2kΩ 4.1 3.0kΩ 4.2 1.3kΩ R1/R3 = (Red) R2/R4 = Black

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