AP5727_11 Datasheet, PDF (2/10 Pages) Diodes Incorporated – BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED

Functional Block Diagram
FB 3
V_IN 5
V _REF
1.25V
A1
-+
EN 4
Shutdown
AP5727
BIAS POWER SUPPLY FOR OLED
SUB DISPLAY AND TFT-LED
Comparator
A2
R
Q
S
Driver
1 SW
Q1
R_C
C_C
Σ
RAMP
Generator
1.2MHz
Oscillator
Figure 2. Block Diagram
2 GND
Pin Descriptions
Name
SW
GND
FB
EN
V_IN
Description
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND pin
Feedback Pin. Reference voltage is 1.25V.
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.
Input Supply Pin. Must be locally decoupled - 4.7μF recommended to reduce input noise.
AP5727
Document number: DS31887 Rev. 2 - 2
2 of 10
www.diodes.com
January 2011
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