Ap2004, Electrical characteristics, Typical application circuit – Diodes AP2004 User Manual
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AP2004
PWM BUCK CONTROLLER
AP2004 Rev. 3
5 of 8
FEBRUARY 2009
©
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