L5953 Просмотр технического описания (PDF) - STMicroelectronics

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L5953

Multiple switching voltage regulator

STMicroelectronics 

L5953

2.6

2.6.1

Functional description

PWM step down voltage regulator

The switching regulator (Figure 11.) inside the L5953 is a voltage control mode (also known

as a direct duty cycle) Buck regulator: the error signal coming from the error amplifier is

compared with a sawtooth to set on and off times of the power switch.

The feedforward control is introduced to get a quickly response to input voltage changes: the

sawtooth has a fixed frequency and an amplitude variable with the battery voltage.

Continuous mode operation is recommended in order to reduce the stress of the output

capacitor and of the free-wheeling diode.

Error amplifier and compensation network

The error amplifier (EA) is a voltage amplifier whose non-inverting input is fixed to the

reference voltage (1.275V bandgap voltage) and whose inverting input and output are

externally available for feedback and frequency compensation.

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