Diodes AP3015 User Manual

Demo Board Manual --- DB-C

Micro Power Step-Up DC/DC Converter AP3015

August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited

1

Content:

1. Description

2. Specification

3. Schematic of the Demo Board

4. PCB Layout

5. Photo View of the Demo Board

6. PCB Dimensions

7. BOM

8. Test Result

Demo Board Manual --- DB-C

Micro Power Step-Up DC/DC Converter AP3015

August. 2006 Rev. 1.2 BCD Semiconductor Manufacturing Limited

2

Description

The AP3015 is a step-up DC/DC converter, which can be used for positive and negative output
LCD/OLED bias supply. In fact, it is a standard boost circuit, where the AP3015 works as the driver
and control device.

The AP3015 features a wide input voltage range. The operation voltage is ranged from 1.2V to
12V. And the output voltage is up to 34V. A current limited, fixed off-time control scheme conserves
operating current, resulting in high efficiency over a broad range of load current. The switch and all
of the control circuit are integrated in the AP3015, so fewer tiny external components are needed in
the PCB board, which are bypass capacitor (Cin), boost inductor (L), boost schottky diode (D),
output capacitor (Cout) and feedback resistor network (R1,R2).

The demo board can be powered from 2.5V to 4.2V. It provides regulated positive output and
negative output. The positive output voltage can be controlled by the feedback resistor. The feedback
reference is 1.23V, so the output voltage can be calculated as 1.23*(R2+R1)/R2. To achieve at
flexible operation, a disable terminal is designed to turn on or turn off the demo board output.

Specification

Item Value

Supply Voltage 2.5 to 4.2V

±6mA@Vin=2.5V

Output Current (Max.)

±10mA@Vin=4.2V

Vout+ 20V ± 5%

Output Voltage

Vout- -20V ± 10%

Ripple & Noise (Max.) 150mV

73%@ Vin=2.5V,Io = ±6mA

Efficiency (Typ.)

76％@Vin=4.2V,Io = ±10mA

Note: The cross regulation can be guaranteed by “Output Voltage”.