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SUB-SYSTEM BOARD 5509

Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V

(±12V) Output, Isolated Power Supply

Oct 25, 2012

Abstract:

This document details the

Oceanside (MAXREFDES9#) subsystem reference design, a 3.3V to 15V

input, ±15V (±12V) output, isolated power supply. The Oceanside design includes a high-efficiency step-up

controller, a 36V H-bridge transformer driver for isolated supplies, a wide input range, and a pair of adjustable

output low dropout (LDO) linear regulator. Test results and hardware files are included.

Introduction

The Oceanside design (MAXREFDES9#) uses a step-up

controller (MAX668), a 36V H-bridge transformer driver

(MAX13256), and a pair of low dropout (LDO) linear

regulators (MAX1659 x2) to create a ±15V (±12V) output

isolated power supply from a wide range of input voltages.

This general purpose power solution can be used in many

different types of isolated power applications, but is mainly

targeted for industrial sensors, industrial automation,

process control, and medical applications.

More detailed image (PDF, 1.8MB)

Figure 1. The Oceanside subsystem design block diagram.

Features Applications

Isolated power

±15V (±12V) outputs

Small printed-circuit board (PCB) area

Pmod

™

-compatible form factor

Industrial sensors

Process control

Industrial automation

Medical

Detailed Description of Hardware

The Oceanside subsystem reference design operates from a 3.3V to 15V DC power source. The MAX668 high-

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Summary of content (8 pages)

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SUB-SYSTEM BOARD 5509 Oceanside (MAXREFDES9#): 3.3V to 15V Input, ±15V (±12V) Output, Isolated Power Supply Oct 25, 2012 Abstract: This document details the Oceanside (MAXREFDES9#) subsystem reference design, a 3.3V to 15V input, ±15V (±12V) output, isolated power supply. The Oceanside design includes a high-efficiency step-up controller, a 36V H-bridge transformer driver for isolated supplies, a wide input range, and a pair of adjustable output low dropout (LDO) linear regulator.
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efficiency step-up controller boosts the input voltage to 16V and connects to the input of the H-bridge transformer driver. The MAX13256 H-bridge transformer driver switches at 425kHz and drives the primary side of the 1:1 turns ratio, with the use of TGMR-501V6LF transformers from Halo® Electronics. The full-wave bridge rectifiers convert the AC outputs of the Halo transformers’ secondary coils into DC outputs. The LDOs regulate the voltages to ±15V.
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Two digital voltmeters Procedure The Oceanside board is fully assembled and tested. Follow the steps below to verify board operation. 1. 2. 3. 4. 5. 6. 7. 8. 9. Place the shunt on jumper JU1 to the 1-2 position. Connect the positive terminal of the power supply to the VIN connector. Connect the negative terminal of the power supply to the GND1 connector. Connect the positive terminal of the first voltmeter to the +15V connector. Connect the negative terminal of the first voltmeter to the GND2 connector.
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Figure 2. Power efficiency vs. current load for a 3.3V input to a ±15V output. Figure 3. Power efficiency vs. current load for a 5V input to a ±15V output. Figure 4. Power efficiency vs. current load for a 12V input to a ±15V output. Figure 5. Power efficiency vs. current load for a 15V input to a ±15V output.
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Figure 6. Power efficiency vs. current load for a 3.3V input to a ±12V output. Figure 7. Power efficiency vs. current load for a 5V input to a ±12V output. Figure 8. Power efficiency vs. current load for a 12V input to ±12V output. The output noise is well below 0.5% of the output voltages. The noise is mainly caused by the switching pulses of the MAX13256. Figures 9 to 16 show the scope shots of the noise for various setups.
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Figure 9. Noise for VIN = 3.3V, VOUT = 15V, IOUT = 0mA. Figure 10. Noise for VIN = 3.3V, VOUT = 15V, IOUT = 65mA = maximum load. Figure 11. Noise for VIN = 15V, VOUT = 15V, IOUT = 0mA. Figure 12. Noise for VIN = 15V, VOUT = 15V, IOUT = 90mA = maximum load. Figure 13. Noise for VIN = 3.3V, VOUT = 12V, IOUT = Figure 14. Noise for VIN = 3.3V, VOUT = 12V, IOUT = 0mA. 75mA = maximum load.
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Figure 15. Noise for VIN = 12V, VOUT = 12V, IOUT = 0mA. Figure 16. Noise for VIN = 12V, VOUT = 12V, IOUT = 100mA = maximum load. All Design Files Hardware Files Schematic Bill of materials (BOM) PCB layout PCB Gerber PCB CAD (PADS 9.0) Buy Reference Design Oceanside (MAXREFDES9#) Halo is a registered trademark of Halo Electronics, Inc. Pmod is a trademark of Digilent Inc. Related Parts MAX13256 36V H-Bridge Transformer Driver for Isolated Supplies MAX1659 350mA, 16.
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Other Questions and Comments: http://www.maximintegrated.com/contact Application Note 5509: http://www.maximintegrated.com/an5509 SUB-SYSTEM BOARD 5509, AN5509, AN 5509, APP5509, Appnote5509, Appnote 5509 © 2013 Maxim Integrated Products, Inc. Additional Legal Notices: http://www.maximintegrated.