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CS3972
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MFG:CS Package Cooled:DIP

CS3 Series Datasheet download

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Part Number: CS3972

MFG: CS

Package Cooled: DIP

Description: The CS3972 is a 1.25A, 60V, current mode, high efficiency, switching regulator circuit. It can be configured in buck, b...

CS3972 General Description

The CS3972 is a 1.25A, 60V, current mode, high efficiency, switching regulator circuit. It can be configured in buck, boost, forward, isolated and non-isolated topologies, using a single-ended switch. The IC contains a 1.25A high efficiency output switch, precision bandgap reference, voltage regulator, error amplifier, oscillator, control, and protection circuitry.

Output transistor efficiency is achieved by keeping the switch in quasi-saturation when it is on. This minimizes the switch turn-off delay time and power dissipation, an important consideration for applications with wide ranging loads.

The precision reference is internally trimmed to 1.24V, while the oscillator frequency is internally trimmed to 40kHz. The on board 2.3V regulator powers the internal circuitry.

By keeping the voltage regulator at 2.3V, the IC is able to operate down to 3V and maintain a constant input supply current of 6mA(typ).

Synchronization mode is achieved by applying a pulsating VC voltage of less than 0.2V with a duration of about 0.5s to VC pin. The switching frequency can be adjusted from 50kHz to 70kHz. The IC's synchronization mode is set externally.

Protection circuitry includes a variable current limit with external voltage clamp, under-voltage and over-temperature protection.

CS3972 Maximum Ratings

Input Voltage Range ...................................................................................................................3V to 60V
Output Switching Voltage..................................................................................................................    75V
Voltage Transient (tr=10s, tf=400ms)................................................................................................60V
ESD (Human Body Model; R=1.5k, C=100pF) ...................................................................................2kV
Junction Temperature Range........................................................................................ -40°C to +150°C
Storage Temperature Range .....................................................................................   -65°C to +150°C
Lead Temperature Soldering
    Wave Solder (through hole styles only)......................................................... 10 sec. max, 260°C peak
    Reflow (SMD styles only) ........................................................60 sec. max above 183°C, 230°C peak
Feedback Pin Voltage (1ms transient)................................................................................................±15V

CS3972 Features

· 75V_MAX, 2A_PEAK Internal witch
· 3V to 60V Input Voltage Range
· 6mA Input Supply Current
· 1.24V Precision Reference
· 40kHz Switching Frequency
· Variable Current Limit with External Voltage Clamp
· Under-Voltage Protection
· Over-Temperature Protection
· External Synchronization

CS3972 Connection Diagram

CS3972 datasheet

CS3972
PDF/DataSheet Download

Datasheet: CS3972
File Size: 190974 KB
Manufacturer: CHERRY [Cherry Semiconductor Corporation]
Click here to Download

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