TC170COE データシートの表示（PDF） - TelCom Semiconductor, Inc

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TC170COE

CMOS CURRENT MODE PWM CONTROLLER

TelCom Semiconductor, Inc 

CMOS CURRENT MODE

PWM CONTROLLER

1

TC170

SWITCH

CURRENT

× 3.15 CURRENT-SENSE

AMPLIFIER

4

+

3

RS

–

–+

0.75V

PWM COMPARATOR

+

–

7

VDD

ERROR

AMPLIFIER

100 µA

FROM

UNDERVOLTAGE

LOCKOUT

Q4

5

+

6

–

V1

LIMIT

BUFFER

AMPLIFIER

Q3

350mV

TC170

LOCK-UP

AMPLIFIER

–

Q1

Q2

+ POSITIVE

FEEDBACK

IL

3.5k

10

2

R

SQ

"A" = 1

OUTPUT

OFF (LOW)

S

PWM LATCH

VREF

5.1V

3

2

R1

1

V1

SHUTDOWN

COMPARATOR

R2

4

16

6k

350mV

5

Figure 1. R1 and R2 Set Maximum Peak Output Current

× 3.15 CURRENT-

SENSE

AMPLIFIER

TC170

I

4

R*

C

RS

3

*OPTIONAL RC FILTER

(A) Ground Reference

I

RS

× 3.15 CURRENT-

SENSE AMPLIFIER

4

3

TC170

(B) Above-Ground Resistive Sensing

Figure 2. Resistive Sensing

TELCOM SEMICONDUCTOR, INC.

6

VOUT

7

8

4-123

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