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Ap2004, Electrical characteristics, Typical application circuit – Diodes AP2004 User Manual

Page 5: 2 1 1 r r

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AP2004

PWM BUCK CONTROLLER

AP2004 Rev. 3

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

= 25V

10

µA

I

DRV

Sink current

V

IN

=

20V

200 mA

Source current

V

IN

=

20V

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

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

22uH

Output

5V/5A

C2

10nF

Optional

Vcc = 12V

P mos

Q1

1

2

3

4

FB

C1

470uF

R3 1K~30K

AF9435P
AF4835P

R1

OU

T

VC
C

CO

M

P

GN

D

SC
P

SS

CT

9K

5A

C4
50nF
Optional

R2

C3

470uF

Step-Down DC/DC converter

8

7

6

5

C6 220nF

C5 50nF

C4 270pF

3K

Vout=Vref

⎛ +

2

1

1

R

R