SWITCHING REGULATOR CONTROL

M51995AP/FP

MITSUBISHI (Dig./Ana. INTERFACE)

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BLOCK DIAGRAM

CLM-

-CURRENT LIMIT

F/B

COLLECTOR

EMITTER

VOLTAGE

REGULATOR

V

V

A

36

36

±2

±0.15

Vcc

Vcc

-4.0 to +4.0

Symbol

Ratings

Unit

Parameter

Conditions

ABSOLUTE MAXIMUM RATINGS

Supply voltage

Collector voltage

Output current

ON/OFF terminal voltage

CLM-terminal voltage

V

V

mA

mW/˚C

-0.3 to +4.0

8

6

5

0~10

-1

-2

CLM+terminal voltage

OVP terminal current

DET terminal voltage

Power dissipation

Thermal derating factor

Operating temperature

Storage temperature

K

W

˚C

1.5

12

-30 to +85

-40 to +125

150

Ta=25˚C

Ta>25˚C

Tj

Junction temperature

Peak

Continuous

2

DET terminal input current

F/B terminal voltage

T-ON terminal input current

T-OFF terminal input current

˚C

˚C

mA

mA

V

mA

V

V

V

Note 1."+" sign shows the direction of current flow into the IC and "-" sign shows the current flow from the IC.

2.This terminal has the constant voltage characteristic of 6 to 8V,when current is supplied from outside.The maximum allowable

voltage is 6V when the constant voltage is applied to this terminal.And maximum allowable current into this terminal is 5mA.

3.The low impedance voltage supply should not be applied to the OVP terminal.

DET

GND

UNDER

VOLTAGE

LOCKOUT

2.5V

OP AMP

PWM

LATCH

PWM

COMPARATOR

INTERMITTENT

ACTION

INTERMITTENT

ACTION AND

OSC CONTROL

-CURRENT

LIMIT LATCH

+CURRENT

LIMIT LATCH

OSCILLATOR

(TRIANGLE)

CLM+

+CURRENT LIMIT

CT

INTERMITTENT OPERATION

DETERMINE CAPACITANCE

LATCH

500

6S

1S

3K

1S

1S

15.2K

7.1V

5.8V

ON/OFF

OVP(shut down)

OSCILLATOR CAPACITANCE CF

OSCILLATOR RESISTANCE T-ON

(ON duty)

OSCILLATOR RESISTANCE T-OFF

(OFF duty)

VF