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PTMA403033N1AZ Datasheet(PDF) 11 Page - Texas Instruments |
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PTMA403033N1AZ Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page www.ti.com t − Time − 20 ms/div VOUT (1 V/div) VIN (10 V/div) IIN (100 mA/div) Output Voltage Trim Adjustment PTMA403033 PTMA402050 PTMA401120 SLTS259A – FEBRUARY 2006 – REVISED MARCH 2006 APPLICATION INFORMATION (continued) Figure 13. Power-up Waveforms An external resistor is required to increase or decrease the output voltage set point of the module by ± 10 %. The resistor, RTRIM, must be connected between the TRIM pin (pin 5) and VO+ (pin 4) to decrease the output voltage, or between the TRIM pin and VO– (pin 6) to increase the output voltage. A 0.05-W rated resistor can be used. The tolerance should be 1%, with a temperature stability of 100 ppm/°C (or better). Place the resistor close to the converter and connect it using dedicated PCB traces (see Figure 14). Table 1 gives the nearest standard value of external resistor for the common voltages within each model's adjust range. Table 1. Standard Values of RTRIM for Common Output Voltages PTMA403033 PTMA402050 PTMA401120 VO RTRIM (kΩ) VO RTRIM (kΩ) VO RTRIM (kΩ) (required) (required) (required) down up down up down up 3.0 V 118 — 4.5 V 18.7 — 10.8 V 64.9 — 3.1 V 187 — 4.6 V 24.9 — 11.0 V 80.6 — 3.2 V 392 — 4.7 V 35.7 — 11.2 V 105 — 3.3 V open open 4.8 V 57.6 — 11.4 V 143 — 3.4 V — 249 4.9 V 121 — 11.6 V 221 — 3.5 V — 124 5.0 V open open 11.8 V 464 — 3.6 V — 82.5 5.1 V — 124 12.0 V open open — — — 5.2 V — 61.9 12.2 V — 118 — — — 5.3 V — 40.2 12.4 V — 57.6 — — — 5.4 V — 29.4 12.6 V — 36.5 — — — 5.5 V — 23.2 12.8 V — 26.1 — — — — — — 13.0 V — 19.6 — — — — — — 13.2 V — 15.8 11 Submit Documentation Feedback |
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