Diodes AP2008 - Manual (Page 3)

AP2008
PWM BUCK CONTROLLER
AP2008 Rev. 2 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 0.77V
Iss
+
-
VCC
Oscillator
10K-300KHz / CT value
SS
+
+
-
Absolute Maximum Ratings
Symbol Parameter Rating Unit
V
CC
Supply voltage 22 V
V
I
Amplifier input voltage 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 temperature range -20 to +85
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 20 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 k Ω
C
T
Timing capacitor 100 6800 pF
F
OSC
Oscillator frequency 10 300 KHz