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HA16114P

Hitachi Semiconductor
Part Number HA16114P
Manufacturer Hitachi Semiconductor
Description Switching Regulator for Chopper Type DC/DC Converter
Published Mar 22, 2005
Detailed Description HA16114P/PJ/FP/FPJ, HA16120FP/FPJ Switching Regulator for Chopper Type DC/DC Converter Description The HA16114P/FP/FPJ ...
Datasheet PDF File HA16114P PDF File

HA16114P
HA16114P

Overview
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ Switching Regulator for Chopper Type DC/DC Converter Description The HA16114P/FP/FPJ and HA16120FP/FPJ are single-channel PWM switching regulator controller ICs suitable for chopper-type DC/DC converters.
Integrated totem-pole output circuits enable these ICs to drive the gate of a power MOSFET directly.
The output logic of the HA16120 is designed to control a DC/DC step-up (boost) converter using an N-channel power MOS FET.
The output logic of the HA16114 is designed to control a DC/DC step-down (buck) converter or inverting converter using a P-channel power MOS FET.
These ICs can operate synchronously with external pulse, a feature that makes them ideal for power supplies that use a primary-control AC/DC converter to convert commercial AC power to DC, then use one or more DC/DC converters on the secondary side to obtain multiple DC outputs.
Synchronization is with the falling edge of the ‘sync’ pulse, which can be the secondary output pulse from a flyback transformer.
Synchronization eliminates the beat interference that can arise from different operating frequencies of the AC/DC and DC/DC converters, and reduces harmonic noise.
Synchronization with an AC/DC converter using a forward transformer is also possible, by inverting the ‘sync’ pulse.
Overcurrent protection features include a pulse-by-pulse current limiter that can reduce the width of individual PWM pulses, and an intermittent operating mode controlled by an on-off timer.
Unlike the conventional latched shutdown function, the intermittent operating function turns the IC on and off at controlled intervals when pulse-by-pulse current limiting continues for a programmable time.
This results in sharp vertical settling characteristics.
Output recovers automatically when the overcurrent condition subsides.
Using these ICs, a compact, highly efficient DC/DC converter can be designed easily, with a reduced number of external components.
Functions • • • • • • 2.
5 V voltage refer...


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