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UCC1806

UCC2806

UCC3806

Low Power, Dual Output, Current Mode PWM Controller

FEATURES

鈥?/div>

BiCMOS Version of UC1846 Families

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1.4mA Maximum Operating Current

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100碌A(chǔ) Maximum Startup Current

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1.0A Peak Output Current

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125nsec Circuit Delay

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Easier Parallelability

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Improved Benefits of Current Mode

Control

DESCRIPTION

The UCC1806 family of BiCMOS PWM controllers offers exceptionally im-

proved performance with a familiar architecture. With the same block dia-

gram and pinout of the popular UC1846 series, the UCC1806 line features

increased switching frequency capability while greatly reducing the bias

current used within the device. With a typical startup current of 50碌A(chǔ) and a

well defined voltage threshold for turn-on, these devices are favored for ap-

plications ranging from off-line power supplies to battery operated portable

equipment. Dual high current, FET driving outputs and a fast current sense

loop further enhance device versatility.

All the benefits of current mode control including simpler loop closing, volt-

age feed-forward, parallelability with current sharing, pulse-by-pulse current

limiting, and push-pull symmetry correction are readily achievable with the

UCC1806 series.

(continued)

BLOCK DIAGRAM

SYNC

10

4.4V

1.5V

13

VC

RT

9

11

AOUT

OSC

CT

8

Q

LO

R

CS鈥?/div>

3

3X

COMP

0.5V

120碌A(chǔ)

S

1

S

2

QB

T

QB

12

SHUTDOWN

LOCK OUT

GND

14

BOUT

CS+

4

鈥?/div>

+

NI

5

EA

S

1

R

Q

7.0V

S

2

S

Q

R

7.5V

15V

5.1V

REFERENCE

REGULATOR

4.25V

REFERENCE LOW

2

VREF

R

200碌A(chǔ)

CURRENT LIMIT

RESTART

UNDER VOLTAGE LOCKOUT

Q

S

1.00V

16

200k

SHUTDOWN

0.35V

1

CURLIM

INV

COMP

6

7

VIN

15

Pin numbers refer to DIL-16 package.

UDG-99035

SLUS272A - FEBRUARY 2000

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