M51995 데이터 시트보기 (PDF) - Renesas Electronics

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M51995

SWITCHING REGULATOR CONTROL

Renesas Electronics 

M51995AP/AFP

Recommended Operating Conditions

• Supply voltage range: 12 to 36 V

• Operating frequency: less than 500 kHz

• Oscillator frequency setting resistance

 T-ON pin resistance RON: 10 k to 75 kΩ

 T-OFF pin resistance ROFF: 2 k to 30 kΩ

Block Diagram

VCC

ON/OFF

Under

voltage

lockout

OVP (shut down)

Latch

7.1 V

5.8 V

Voltage

regulator

15.2 k

3k

1S

1S

1S

F/B

DET GND

500

6S

−

OP AMP

+

2.5 V

PWM

Comparator

PWM

latch

Oscillator capacitance

CF

Oscillator resistance

T-ON (ON duty)

Oscillator resistance

T-OFF (OFF duty)

VF

Oscillator

(triangle)

+Current

limit latch

−Current

limit latch

Intermittent

action and

OSC control

Intermittent

action

Collector

VOUT

Emitter

CLM+

CLM−

+Current limit −Current limit

CT

Intermittent operation

determine capacitance

REJ03D0835-0300 Rev.3.00 Jun 06, 2008

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