MAXREFDES1194
Reference Guide
(PDF 1 MB)
09 Jul 2019
Description
The MAXREFDES1194 is a no-opto flyback DC-DC power supply that delivers five outputs from a 6V to 60V supply voltage. It is designed for equipment that needs multichannel, isolated power supplies with a wide input voltage range.
The MAXREFDES1194 employs the no-opto flyback control technique of the MAX17690. This document explains how the MAX17690 peak current-mode PWM converter can be used to generate five isolated outputs from a 6V to 60V input voltage. An overview of the design specification is shown above.
Due to its simplicity and low cost, the flyback converter is the preferred choice for low-to-medium isolated DC-DC power-conversion applications. However, the use of an optocoupler or an auxiliary winding on the flyback transformer for voltage feedback across the isolation barrier increases the number of components and design complexity. The MAX17690 eliminates the need for an optocoupler or auxiliary transformer winding and achieves ±5% output voltage regulation over line, load, and temperature variations.
The MAX17690 implements an innovative algorithm to accurately determine the output voltage by sensing the reflected voltage across the primary winding during the flyback time interval. By sampling and regulating this reflected voltage when the secondary current is close to zero, the effects of secondary-side DC losses in the transformer winding, the PCB tracks, and the rectifying diode on output voltage regulation can be minimized. The MAX17690 also compensates for the negative temperature coefficient of the rectifying diode.
Features
- 4.5V to 60V Input Voltage Range
- Programmable Switching Frequency from 50kHz to 250kHz
- Programmable Input Enable/UVLO Feature
- Programmable Input Overvoltage Protection
- Adjustable Soft-Start
- 2A/4A Peak Source/Sink Gate Drive Capability
- Hiccup Mode Short-Circuit Protection
- Fast Cycle-by-Cycle Peak Current Limit
- Thermal Shutdown Protection
- Space-Saving, 16-Pin, 3mm x 3mm TQFN Package
- -40°C to +125°C Operating Temperature Range
Designed, Built, Tested
Board pictured here has been fully assembled and tested. Not available for sale.
Schematic
PCB Layout
BOM
Test Results
Parametrics
| Input Type | Vin(Min) | Vin(Max) | Iout(Max) | Single/Multiple Output | Vout(V) | Pout(W) | Isolated/Non-Isolated | Topology |
|---|---|---|---|---|---|---|---|---|
| DC | 6 | 60 | 0.3 | - | 3 | 1.084 | Isolated | No-Opto Flyback |
Parametrics
| Input Type | DC |
| Vin(Min) | 6 |
| Vin(Max) | 60 |
| Iout(Max) | 0.3 |
| Single/Multiple Output | - |
| Vout(V) | 3 |
| Pout(W) | 1.084 |
| Isolated/Non-Isolated | Isolated |
| Topology | No-Opto Flyback |
Maxim Devices (1)
Part Number
|
Name
|
Product Family
|
Order
|
Design kits and evaluation modules |
|---|---|---|---|---|
| MAX17690 | 60V, No-Opto Isolated Flyback Controller | Isolated Power | Buy Now | Design Kits |
Maxim Devices (1)
| Part Number
|
Product Family
|
|---|---|
|
Isolated Power
60V, No-Opto Isolated Flyback Controller
|
Design Files (6)
| Title
|
Type
|
Size
|
Date
|
|---|---|---|---|
 MAXREFDES1194-PCB |
129KB | 2019-07-09 | |
| MAXREFDES1194-schematic |
436KB | 2019-07-09 | |
| maxrefdes1194-pcb |
479KB | 2019-08-27 | |
| maxrefdes1194-schematic |
21KB | 2019-08-27 | |
| maxrefdes1194-bom |
1MB | 2019-07-09 | |
| TTS MAXREFDES Test Results Template_Rev 0_0318 |
191KB | 2019-07-09 |
| Date
|
Type
|
|---|---|
| 2019-07-09 |
(PDF, 129KB) |
| 2019-07-09 |
(PDF, 436KB) |
| 2019-08-27 |
(PDF, 479KB) |
| 2019-08-27 |
(PDF, 21KB) |
| 2019-07-09 |
(PDF, 1MB) |
| 2019-07-09 |
(PDF, 191KB) |
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