Maxim's Rainier family of isolated power devices enable
cooler, smaller, and simpler power-supply solutions. The
MAX17691A/B is a high efficiency No-Opto integrated
nMOSFET flyback converter that uses fixed frequency
peak current mode control. The device senses the isolated
output voltage directly from the primary-side flyback waveform
during secondary-side rectifier conduction. No secondary-
side error amplifier and optocoupler are required
to provide an accurate, isolated, regulated output voltage,
saving up to 20% of PCB space normally required for a
traditional flyback converter.
The MAX17691A/B features a low R
DSON, 76V, 170mΩ
integrated nMOSFET primary switch and is designed to
operate over a wide supply range from 4.2V to 60V. The
switching frequency of the device is programmable from
100kHz to 350kHz. An EN/UVLO feature allows the user
to turn ON/OFF the power converter precisely at the desired
input voltage. Input overvoltage protection can be
implemented using the OVI pin (MAX17691A only). Softstart
limits inrush current at startup. The MAX17691A/B
supports external clock synchronization to avoid low-frequency
“beats” on the input bus in systems with multiple
converters. The device also has programmable frequency
dithering for low-EMI, spread-spectrum operation.
The MAX17691A/B allows temperature compensation for
variations in the output rectifier diode forward voltage
drop. The MAX17691A is internally compensated for loop
stability, while the MAX17691B offers external loop compensation
flexibility. The MAX17691A/B has robust hiccup-
protection and thermal protection schemes, and is
available in a space-saving 12-pin, 3mm x 3mm TDFN
package with a temperature range from -40°C to +125°C.
Applications
- Isolated Power Supplies
- PLC I/O Modules
- IGBT Gate Drive Supplies
- Industrial and Telecom Applications
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