DS_IPM12S0A008_03202007

10

The amount of power delivered by the module is the

voltage at the output terminals multiplied by the output

current. When using the trim feature, the output voltage

of the module can be increased, which at the same

output current would increase the power output of the

module. Care should be taken to ensure that the

maximum output power of the module must not exceed

Voltage Margining

Output voltage margining can be implemented in the IPM

pin to the ground pin for margining-up the output voltage

to the output pin for margining-down. Figure 31 shows

the circuit configuration for output voltage margining. If

unused, leave the trim pin unconnected.

Vo

On/Off

Vin

GND

Trim

IPM

Q2

Q1

Rmargin-up

Rmargin-down

Rtrim

Figure 31: Circuit configuration for output voltage margining

Table 1 provides Rtrim values required for some common

output voltages, while Table 2 provides value of external

voltage source, Vtrim, for the same common output

voltages. By using a 0.5% tolerance resistor, set point

tolerance of ±2% can be achieved as specified in the

electrical specification.

Table 1

VO (V)

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

Table 2

VO (V)

Vtrim (V)

0.80

0.705

0.90

0.700

1.2

0.685

1.5

0.671

1.8

0.656

2.5

0.622

3.3

0.583

5.0

0.500