8.2.4 Output Voltage Set-Point Adjustment Range (Trim)
Output Voltage Set-Point Adjustment can be carried out by using an external resistor or external voltage source to increase or decrease the output voltage set-point (please refer to the data sheet for the detailed specification). Refer all trim voltage requirements to Item 7.1-6, 7.1-7, 7.1.8, and refer all the design numbers to Evaluation Board Schematic.
(1) Output Voltage Set-Point Adjustment by using an external resistor
For IPM12C series
To implement Trim-up by using an external resistor, Rtrim-upmust be connected between the TRIM pin and ground. For IPM12C0A0R04A, Please refer to the IPMR table for the desired
Vout. The value of Rtrim-upalso be referred for further
can be calculated by the following equation and the datasheet can information.
Rtrim−up = | 3.752 | |
| Vout − 0.9 | |
| |
| | |
− 0.261 kΩ
To implement Trim-down by using an external resistor, Rtrim-downmust be connected between the TRIM pin and Vout. For IPM12C0A0R04A, Please refer to the IPMR table for the desired
Vout. The value of Rtrim-downcan be calculated by the following equation and the datasheet can also be referred for further information.
IPMR: Rtrim values versus some commonly used Vout for IPM12C0A0R04A.
Vout | Rtrim (Ω) |
0.800 | 5.09K |
0.900 | Open |
1.0 | 37.2K |
1.2 | 12.2K |
1.5 | 5.98K |
1.8 | 3.90K |
2.5 | 2.08K |
3.3 | 1.30K |
5.0 | 653 |
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