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TSM1011
(Rev.:2016)

Constant Voltage and Constant Current Controller for Battery Chargers and Adapters

STMicroelectronics 

Voltage and current control

TSM1011

Equation 4

Plim = Vsense  Ilim

Therefore, for most adapter and battery charger applications, a quarter-watt, or half-watt

resistor to make the current sensing function is sufficient.

The current sinking outputs of the two transconductance operational amplifiers are common

(to the output of the IC). This makes an ORing function which ensures that whenever the

current or the voltage reaches too high values, the optocoupler is activated.

The relation between the controlled current and the controlled output voltage can be

described with a square characteristic as shown in the following V/I output power graph.

Figure 4. Output voltage versus output current

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