SGM46000.pdf
No.10852
? Provides Up to 3W to the Transformer in Isolated Power Supplies
? Single Supply 2.5V to 5.5V Wide Operation Range
? Internal Resistor-Programmable Oscillator Mode
? External Clock Mode with Watchdog
? Disable Mode
? Under-Voltage Lockout Function
? Thermal Shutdown
? -40℃ to +125℃ Operating Temperature Range
? Available in Green SOIC-8 (Exposed Pad) Package
The SGM46000 is an integrated primary-side controller and H-bridge driver for isolated power-supply circuits. The device contains an on-board oscillator, protection circuitry and internal FET drivers to provide up to 3W of power to the primary winding of a transformer from +5V power supply. The SGM46000 can be operated using the internal programmable oscillator or can be driven by an external clock for improved EMI performance. Regardless of the clock source being used, an internal flip-flop stage guarantees a fixed 50% duty cycle to prevent DC current flow in the transformer.
The SGM46000 operates from a single-supply voltage of 2.5V to 5.5V, and includes under-voltage lockout for controlled startup. The device prevents crossconduction of the H-bridge MOSFETs by implementing break-before-make switching. Thermal shutdown circuitry provides additional protection against damage due to over-temperature conditions.
