Diodes AP5727 - Manual (Page 2)

AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
AP5727
Document number: DS31887 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
© Diodes Incorporated
NEW PROD
UC
T
Functional Block Diagram
1.2MHz
Oscillator
RAMP
Generator
Σ
-
+
-
+
- +
V
REF
1.25V
V
IN
3 FB
R
C
C
C
Comparator
A2 R
S
Q
A1
1
Driver
SW
Q1
2 GND
4 EN Shutdown
5
Figure 2. Block Diagram
Pin Descriptions
Name Description
SW Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND GND pin
FB Feedback Pin. Reference voltage is 1.25V.
EN
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not
used, connect EN to the input source for automatic startup. The EN pin cannot be left floating.
V
IN
Input Supply Pin. Must be locally decoupled - 4.7 μF recommended to reduce input noise.