Diodes AP2004 Manuel d'utilisateur télécharger pdf (Page 3)

AP2004

PWM BUCK CONTROLLER

AP2004 Rev. 3 3 of 8 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Block Diagram

Bandgap

Reference

OUT

PWM Amplifier

FB

VCC

SCP

CT

Error Amplifier

COMP

UVLO

GND

0.7V

1.5V

+

-

2.5V

Internal use

1.25V

Iss

+

-

VCC

Oscillator

MAX.300KHz

SS

+

+

-

Absolute Maximum Ratings

Symbol Parameter Rating Unit

P

D

Power dissipation at 25°C

600 mW

V

CC

Supply voltage 28 V

V

I

Ampli

f

ier input volta

g

e 20 V

V

O

Collector output voltage V

CC

-1.0V V

I

SOURCE

Source current 200 mA

I

SINK

Sink current 200 mA

T

OP

Operating junction temperature range -20 to +125

o

C

T

ST

Storage temperature range -65 to +150

o

C

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

CC

Supply voltage 3.6 27 V

V

I

Amplifier input voltage 1.05 1.45 V

V

O

Collector output voltage Vcc-1.5 V

I

FB

Current into feedback terminal 45 µA

R

F

Feedback resistor 100 kΩ

C

T

Timing capacitor 100 6800 pF

F

OSC

Oscillator frequency 10 300 KHz

1 2 3 4 5 6 7 8

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