MAX17690
60V, No-Opto Isolated Flyback Controller
Compact, Cost-Effective, and Easy-to-Implement Isolated DC-DC Controller
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Key Features
Applications/Uses
| Compliance | IEEE 802.3af IEEE 802.3at IEEE 802.3bt |
| PWM | Yes |
| Switching Frequency (kHz) | 50-250 |
| Package/Pins | TQFN-CU/16 |
| Oper. Temp. (°C) | -40 to +125 |
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 60 |
| Topology | Flyback |
| Application (VIN) | Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V) |
| Switch Type | External |
| Control Loop | Current Mode |
| Feedback | Primary Side |
| Switching Frequency (kHz) | 250 |
| Duty Cycle (%) (max) | 69 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | TQFN-CU/16 |
| Budgetary Price (See Notes) | 3.66 |
Simplified Block Diagram
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Sampling:
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Parameters
| Compliance | IEEE 802.3af IEEE 802.3at IEEE 802.3bt |
| PWM | Yes |
| Switching Frequency (kHz) | 50-250 |
| Package/Pins | TQFN-CU/16 |
| Oper. Temp. (°C) | -40 to +125 |
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 60 |
| Topology | Flyback |
| Application (VIN) | Base Station (24V) Industrial (24V) Networking (48V) Power Over Ethernet (32-58V) |
| Switch Type | External |
| Control Loop | Current Mode |
| Feedback | Primary Side |
| Switching Frequency (kHz) | 250 |
| Duty Cycle (%) (max) | 69 |
| Oper. Temp. (°C) | -40 to +125 |
| Package/Pins | TQFN-CU/16 |
| Budgetary Price (See Notes) | 3.66 |
Key Features
- 4.5V to 60V Input Voltage Range
- No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
- 2A/4A Peak Source/Sink Gate Drive Currents
- 50kHz to 250kHz Programmable Switching Frequency
- Input EN/UVLO Feature
- Input Overvoltage Protection
- Programmable Soft-Start
- Hiccup-Mode Short-Circuit Protection
- Thermal Shutdown Protection
- -40°C to 125°C Operating Temperature Range
- Space-Saving, 16-Pin 3 x 3 TQFN Package
Applications/Uses
- Industrial and Telecom Applications
- Isolated Flyback Converters
- PLC I/O Modules
- Wide-Range DC-Input Isolated Power Supplies
Description
The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated flyback topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the primary switch. No auxiliary winding or optocoupler is required for output voltage regulation.
The MAX17690 is designed to operate over a wide supply range from 4.5V to 60V. The switching frequency is programmable from 50kHz to 250kHz. A EN/UVLO pin allows the user to turn on/off the power supply precisely at the desired input voltage. The MAX17690 provides an input overvoltage protection through the OVI pin. The 7V internal LDO output of the MAX17690 makes it suitable for switching both logic-level and standard MOSFETs used in flyback converters. With 2A/4A source/sink currents, the MAX17690 is ideal for driving low RDS(ON) power MOSFETs with fast gate transition times. The MAX17690 provides an adjustable soft-start feature to limit the inrush current during startup.
The MAX17690 provides temperature compensation for the output diode forward voltage drop. The MAX17690 has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 16-pin 3mm x 3mm TQFN package with a temperature range from -40°C to 125°C.
Get Started with No-Opto Flyback Technology and the MAX17690
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
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