DIODES AP3012K 1.5MHz Step Up DC-DC Converter User Guide

DIODES AP3012K 1.5MHz Step Up DC-DC Converter

Specifications :

• High power, constant frequency, current mode PWM step-up converter
• Operates at 1.5MHz frequency for use with small inductors
• Built-in overvoltage protection (OVP)
• 36V 500mA Rugged Integrated Bipolar Switch
• Built-in Soft-start to Reduce Inrush Current During Start-up
• Standard SOT25 package

Product Usage Instructions

Quick Start Guide:

1. Connect a power supply to VIN and GND, set VIN to 5V.
2. Connect electronic load positive terminal to VOUT, negative terminal to GND.
3. To enable IC, place a jumper at JH6 to ON position, disable by moving to OFF position.
4. Verify 24V output voltage at VOUT and GND terminals.
5. Check for stable operation with a 30mA load, monitor SW signal with an oscilloscope.

Measurement/Performance Guidelines:

1. Maintain short ground lengths when measuring output voltage ripple.
2. For efficiency measurements, use an ammeter for input current and an electronic load for output current.

FAQ:

• Q: What should I do if the output voltage exceeds the OVP threshold?
  A: The device will go into shutdown mode automatically when the output voltage surpasses the OVP threshold of 29V.

• Q: How can I measure the switching frequency?
  A: Connect an oscilloscope to monitor the SW signal and measure the switching frequency for stable operation.

AP3012K
EVB User Guide
1.5MHz, Step-Up DC/DC Converter

DESCRIPTION

• The AP3012 is a high power, constant frequency, current mode PWM, inductor based, step-up (boost) converter. The converter operates at high frequency (1.5MHz) so that a small, low profile inductor can be used.
• The AP3012 has built-in overvoltage protection (OVP) to allow the device to go into shutdown mode when the output voltage exceeds the OVP threshold of 29V.
• The AP3012 is available in standard SOT25 package.

FEATURES

• High Efficiency up to 81%
• Adjustable Output Voltage up to 29V
• Shutdown Current 1µA Typical
• 1.5MHz Switching Frequency
• 36V 500mA Rugged Integrated Bipolar Switch
• Built-in Soft-start to Reduce Inrush Current During Start-up
• On-chip Overvoltage Protection

APPLICATIONS

• LCD/OLED Display Bias Supply
• White LED Driver for LCD Display Backlights
• Cellular Phones

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

EVALUATION BOARD

QUICK START GUIDE

The AP3012K-EVM has a simple layout and allows access to the appropriate signals through test points. To evaluate the performance of the AP3012KTR, follow the procedure below:

1. Connect a power supply to the input terminals VIN and GND. Set VIN to 5V.
2. Connect the positive terminal of the electronic load to VOUT and negative terminal to GND.
3. For Enable, to enable IC, place a jumper at JH6 to “ON” position to connect EN pin to VIN through 100KΩ resistor. Jump to “OFF” position to disable IC.
4. The evaluation board should now power up with a 24V output voltage.
5. Check for the proper output voltage of 24V at the output terminals VOUT and GND. Measurement can also be done with a multimeter with the positive and negative leads between VOUT_S and GND.
6. Set the load to 30mA through the electronic load. Check for the stable operation of the SW signal on the oscilloscope. Measure the switching frequency.

MEASUREMENT/PERFORMANCE GUIDELINES

1. When measuring the output voltage ripple, maintain the shortest possible ground lengths on the oscilloscope probe. Long ground leads can erroneously inject high-frequency noise into the measured ripple.
2. For efficiency measurements, connect an ammeter in series with the input supply to measure the input current. Connect an electronic load to the output for output current.

EVALUATION BOARD SCHEMATIC

TOP LAYOUT INNER LAYER 2 LAYOUT

INNER LAYER 3 LAYOUT

BOTTOM LAYOUT

BILL OF MATERIALS (BOM) for AP3012K-EVM

Ref| Value| Description| Qty| Size| Vendor Name| Manufacturer PN
---|---|---|---|---|---|---
C1| 1µF| Ceramic Capacitor, 25V, X7R, 10%| 1| 0805| Murata| GCM21BR71E105KA56L
C3| 0.1µF| Ceramic Capacitor, 25V, X7R, 10%| 1| 0603| Murata| GCJ188R71E104KA12D
C4| 1µF| Ceramic Capacitor, 35V, X7R, 10%| 1| 0805| Murata| GCM21BR7YA105KA55L
R4| 100KΩ| RES SMD 1%, 1/10W| 1| 0603| Panasonic| ERJ-3EKF1003V
R1| 180KΩ| RES SMD 1%, 1/10W| 1| 0603| Panasonic| ERJ-3EKF1803V
R2| 10KΩ| RES SMD 1%, 1/10W| 1| 0603| Panasonic| ERJ-3EKF1002V
L1| 10µH| DCR=322mΩ, Ir=1.65A| 1| 3.0×3.0x2.0 mm| Wurth Electronics| 74438336100
D1| | Diode Schottky 40V, 1A| 1| SMB| Diodes Incorporated (Diodes)| **** B140B-13-F
JH6| | PCB Header, 40 POS| 1| 1×3| Wurth Electronics| 61304011121
IN_S, OUT_S, SHDN, GNDx2| 1573| Terminal Turret 0.082″ L (Test Points)| 5| Through- Hole| Keystone Electronics| 1573-2
JH1, JH2, JH3, JH4| 1598| Terminal Turret Triple 0.094″ L (Test Points)| 4| Through- Hole| Keystone Electronics| 1598-2
U1| AP3012| Sync DC/DC Converter| 1| SOT25| Diodes| AP3012KTR

TYPICAL PERFORMANCE CHARACTERISTICS

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References

• Diodes Incorporated - Analog, Discrete, Logic, Mixed-Signal
• Diodes Incorporated - Analog, Discrete, Logic, Mixed-Signal
• Important Notice
• diodes.com/about/company/terms-and-conditions/terms-and-conditions-of-sales/

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