Ap5727, Bias power supply for oled sub display and tft-led, New prod uc t functional block diagram – Diodes AP5727 User Manual
Page 2: Pin descriptions
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.