GoChip Elec Tech (Shanghai) GH9280

The GH9280 is a one-chip IC solution for driving two-coil brushless DC cooling fans. This IC consists of voltage reference, Hall sensor, signal amplifier, wave shaping circuit, locked rotor detector, locked rotor protection and restart circuit, output drive circuit, etc.. To allow survival in a harsh environment and in consideration of low cost, the GH9280 has been designed with many functions internally, and requires less external components. When there is no motion for 0.5 second, the IC will detect locked rotor conditions, enter protection mode automatically and disable two outputs for 4 seconds. Then, it will turn on driver current from one channel for 0.5 second. If it still fails to detect fan rotation, the GH9280 will shut off the outputs for 4 seconds again. This sequence will be repeated until rotation condition is detected and the IC enters normal operation mode. This on/off cycling reduces the average current about 80%. This function prevents the chip and the fan from overheating and damage due to long time locked rotor. The GH9280 is available in TO-94 (SIP-4L) package.

• On Chip Hall Effect Sensor
• 3.5~18V Power Supply Voltage Drivers Allow 500mA Without Overheating
• Locked Rotor Shutdown and Auto Restart
• Built-in Zener Diodes Protection for Output Driver
• Embedded Over-Temperature Protection
• Precise Magnetic Switching Thresholds

• Dual-coil Brushless DC Fan
• Dual-coil Brushless DC Motor