TSM101/A

8/13

Figure 4 : An Auxiliary Winding for TSM101 Power Supply

5.3. Higher Precision for the Voltage Control

The voltage drop through the sense resistor R5

offsets the voltage measurement. In most battery

charging applications, this offset is not taken into

account because the error is negligeable com-

pared to the end-of-charge voltage due to the fact

that the charging current value decreases drasti-

cally during the final phase of the battery charging.

But in other applications needing highest possible

precision in voltage control, another connecting

schematic is possible for TSM101 as shown on

figure 5.

Figure 5 : Precise Output Voltage Control

In this schematic, the 0V reference is defined as

the common point between the sense resistor, the

0V Output Voltage, the foot of the resistor bridge

R6/R7, and the ground (pin 4) of the TSM101.

TSM101A (1% internal voltage reference preci-

sion) is required in such applications.