Hardware Design-E-paper display voltage boost power supply circuit

E-Paper modules require a simple voltage boost power supply circuit. 

For larger production, you will want to design this circuit onto your PCB. For prototyping and small production, 

GoodDisplay has created the tiny and helpful DESPI-C02 adapter(also development kits for STM32/Arduino/ESP32/ESP8266 (Arduino IDE))

which allows you to get your E-Paper project moving quickly.

Diagram of voltage boost circuitfor SPI e-paper (IC UC series E-paper)

How does the E-paper dispaly voltage boost power supply circuit work?

Generally, SPI E-paper display voltage boost circuit is completed outside the IC. The principle is similar to traditional switching power supply,

mainly sending MOS tube switch signal through E-paper IC, When the MOS tube is turned on, the inductance coil stores electricity and the capacitor discharges;

When the MOS tube is disconnected, the capacitor is charged, and the capacitor charging and discharging is deployed to realize the voltage boost.

Questions most people might ask

MOS tube selection:

We recommend that the MOS tube use Si1304BDL or Si1308EDL.

Some customers also asked us: Can the SI1308EDL N-MOS FET be replaced by the A03400?

Answer: Yes.

READ MORE: Circuit Design of SPI Electronic Paper Display - Selection of MOS Tubes

For the parameter selection of the inductor, we recommend the inductor to choose the winding inductor 10uH 1A.

A customer asked: Can the inductor 10uh 1a be replaced with SMD inductor 4.7UH, 1.5A?

Answer: This part cannot be changed.

Other related questions

Can Schottky barrier diode MBR0530 be replaced with EP10QY03?

Answer: We can't be sure for it and it should be done by customer side to verify the result.

Can voltage boost circuit automatically works if I only power on the e-paper display?

The E-paper boost circuit is turned on with a fixed register. The boost circuit can be boosted only when the microcontroller sends the open boost command to the E-paper IC.

Why is there no MOS tube in the 1.02-inch electronic paper display driver circuit?

The 1.02 inch e-paper display uses a booster circuit inside the IC, so no MOS tube is required. But capacitors around the chip are still necessary.

What are the possible reasons for the overheating of the MOS tube?

It may be that the diode was soldered in the wrong direction, so the MOS tube is short-circuited.