M51995AFP datasheet(4/43 Pages) RENESAS

Numer części	M51995AFP

Szczegółowy opis	Switching Regulator Control

PDF	43 Pages

Scroll/Zoom	100%

Producent	RENESAS [Renesas Technology Corp]

Strona internetowa	http://www.renesas.com

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4 / 43 page

M51995AP/AFP

REJ03D0835-0300 Rev.3.00 Jun 06, 2008

Page 2 of 40

Recommended Operating Conditions

• Supply voltage range: 12 to 36 V

• Operating frequency: less than 500 kHz

• Oscillator frequency setting resistance

 T-ON pin resistance R

ON: 10 k to 75 kΩ

 T-OFF pin resistance R

OFF: 2 k to 30 kΩ

Block Diagram

Under

voltage

lockout

Voltage

regulator

7.1 V

5.8 V

15.2 k

3 k

500

F/B

DET

GND

VCC

Latch

ON/OFF

OVP (shut down)

Oscillator capacitance

Oscillator resistance

T-ON (ON duty)

Oscillator resistance

T-OFF (OFF duty)

CLM+

+Current limit

CLM

−

−Current limit

Intermittent operation

determine capacitance

Collector

VOUT

Emitter

6 S

1 S

PWM

Comparator

PWM

latch

−

OP AMP

2.5 V

Intermittent

action

Intermittent

action and

OSC control

−Current

limit latch

+Current

limit latch

Oscillator

(triangle)

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