MC33129 Просмотр технического описания (PDF) - Motorola => Freescale

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производитель

MC33129

High Performance Current Mode Controllers

Motorola => Freescale 

FreescalMeCS34e1m29iMcCo3n3d1u29ctor, Inc.

12

CSoft–Start

7

6

RT

5

CT

4

Sync/Inhibit Input

Figure 18. Representative Block Diagram

VCC

1.0µA

Fault Timer

VCC

2.5V Reference

+ 1.25V

–

R

R

Oscillator

32k

+

1.95V

PWM

Comparator

+

–

+

275mV

Latch

R

Q

S

+

– Start/Run

Comparator

7.0V

Undervoltage

Lockout

+

VCC

3.6V

Start/Run

Output

13

14

VCC

14.3V

80µA

1.25V

8

Reference

+

–

Soft–Start

Buffer

+

Error Amp –

VCC

9 Noninverting

Input

10 Inverting

Input

Feedback/PWM

11 Input

1 Drive Output

2

Drive

Gnd

3

Ramp Input

Vin = 20V

Q1

RS

Sync/Inhibit Input

Capacitor CT

Latch

“Set” Input

Feedback/PWM Input

Ramp Input

Latch

“Reset” Input

Drive Output

20 V

Start/Run

Output

14.3 V

+

–

=

Sink Only

Positive True Logic

Figure 19. Timing Diagram

600 µs Delay

MOTOROLA ANALOG IC DEVICEFDoArTMA ore Information On This Product,

9

Go to: www.freescale.com

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