ML4818CS datasheet(1/12 Pages) MICRO-LINEAR

tên linh kiện	ML4818CS

Giải thích chi tiết về linh kiện	Phase Modulation/Soft Switching Controller

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May 1997

ML4818

*

Phase Modulation/Soft Switching Controller

1

GENERAL DESCRIPTION

The ML4818 is a complete phase modulation control IC

suitable for full bridge soft switching converters. Unlike

conventional PWM circuits, the phase modulation

technique allows for zero-voltage switching transitions

and square wave drive across the transformer. The IC

modulates the phases of the two sides of the bridge to

control output power.

The ML4818 can be operated in current mode. The delay

times for the outputs are externally programmable to

allow the zero-voltage switching transitions to take place.

Pulse-by-pulse current limit, integrating fault detection,

and soft start reset are provided. The under-voltage

lockout circuit features a 6V hysteresis with a low starting

current to allow off-line start up with a low power bleed

resistor. A shutdown function powers down the IC, putting

it into a low quiescent state.

* Some Packages Are Obsolete)

10

13

11

2

3

5

8

9

12

4

24

20

16

17

22

21

14

*

ILIM

RCRESET

SOFT START

INV

E/A OUT

CT

RAMP

RT

CLOCK

SHUTDOWN

VREF

VCC

A2 OUT

A1 OUT

B1 OUT

B2 OUT

RDELAY

GND

REFERENCE

AND

UNDER-VOLTAGE

LOCKOUT

–

+

T FLIP

FLOP

T

Q

S

Q

R

OSC

Q

+

–

ΦMOD

–

+

ERROR

AMP

V+

I1

+5V

3V

Q

R

S

+

–

1V

DELAY

VCC

DELAY

VCC

DELAY

VCC

DELAY

INHIBIT

OUTPUTS

*PINS 1, 6, 7, 15, 18, 19 AND 23 ARE GND

0.7V

I2

+

R

S

FEATURES

s

Full bridge phase modulation zero voltage switching

circuit with programmable ZV transition times

s

Constant frequency operation to 500kHz

s

Current mode operation

s

Cycle-by-cycle current limiting with integrating fault

detection and restart delay

s

Precision buffered 5V reference (+1%)

s

Four 1.5A peak current totem-pole output drivers

s

Under-voltage lockout circuit with 6V hysteresis

s

Power DIP package allows higher dissipation

BLOCK DIAGRAM

Số phần tương tự - ML4818CS

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Mô tả tương tự - ML4818CS

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