Diodes AP2008 Manuel d'utilisateur télécharger pdf (Page 5)

AP2008

PWM BUCK CONTROLLER

AP2008 Rev. 2 5 of 8 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Electrical Characteristics (Continued) (T

A

=25ºC, V

CC

=6V, f=200 Khz)

Output section

Symbol Parameter Conditions Min Typ. Max Unit

I

LEAK

Leakage current V

O

= 20V 10 µA

I

DRV

Sink current V

IN

= 12V 200 mA

Source current V

IN

= 12V 200 mA

V

SAT

Output saturation voltage I

O

= 10 mA 1.0 1.5 V

I

SC

Short-circuit output current V

O

= 6V 120 mA

PWM comparator

Symbol Parameter Conditions Min Typ. Max Unit

V

T0

Input threshold voltage at f = 10 KHz

(COMP)

CT=6800pF 0.6 0.7 V

V

T100

Maximum duty cycle 1.2 1.3 V

Total device

Symbol Parameter Conditions Min Typ. Max Unit

I

CCA

Average supply current C

T

= 270pF 6 10 mA

Soft Start

Symbol Parameter Conditions Min Typ. Max Unit

V

SS

Soft-start Voltage 2.3 V

I

SS

Constant Charge Current 20 µA

Typical Application Circuit

L1

10uH

R1

R2

C3

470uF

Output

Step-Down DC/DC converter

C2

10nF

(Optional)

Vcc = 12V

P mos

Q1

1

2

3

8

7

6

5

4

OUT

FB

VCC

COMP

GND

SCP

SS

CT

C6 220nF

C5 50nF

C4 270pF

1K

4K

C1

470uF

5A

R3 30K

C4

50nF

(Optional)

1V/5A

1 2 3 4 5 6 7 8

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