HV9901 Universal Relay Driver Features General Description The HV9901 universal relay driver provides 10V to 450V Input Voltage Range high-efficiency driving for low-voltage relays with sup- Energy-saving Hold Current Mode ply voltages as high as 450V. For example, a relay with Adjustable Microcontroller Supply a 5V coil can be driven directly from the rectified Low Supply Current <1 mA 120 VAC or 230 VAC line. Constant-current Coil Drive The IC includes two high-voltage linear regulators. The Programmable Pull-in Current, Pull-in Time and first one is for providing power to internal control cir- Hold Current cuitry. The second one has an adjustable output volt- age and a 1 mA output current capability to support Applications external circuitry, such as a microcontroller control Industrial Controls circuit. Relay Timers The pull-in current, pull-in time and hold current for the Solenoid Drivers relay are individually programmable through two resis- Home Automation tors and a capacitor. PWM switching can be synchro- nized with an external clock or with another HV9901 operating at a higher frequency. The relay is operated through the enable input ENI. Logic polarity is under control of the polarity input POL. Audible noise coming from the relay can be sup- pressed by operating at a PWM frequency exceeding 20 kHz. Package Type 16-lead SOIC 1 16 4 See Table 2-1 for pin information. WARNING The HV9901 is suited for relay driving applications operating at hazardous voltage. Ensure that adequate safeguards are provided to protect the end user from electrical shock. 2016-2019 Microchip Technology Inc. DS20005550B-page 1HV9901 Functional Block Diagram VIN 1 16 VDD 4.7F UVLO + C - 1.25V VREF A Bandgap 15 Reference R HDA 100 nF R LED 14 C 2R HD HOLD/DELAY 10K R HDB VDD GT FB S 4 13 R FBB VDD VN2460N8 - Delay R 215ns Q + FBA R Delay R CS 100 nF 1.25V 5.5 k 5 - 12 C VCC HD 5.0V + Low Limit High Limit R P S - VDD C + COM ENI 6 11 VDD Oscillator shutdown 40A High Duty SYNC ENO 7 Cycle 10 Oscillator R OSC POL RT 9 8 2016-2019 Microchip Technology Inc. DS20005550B-page 2 1N4937 RELAY