1 Features

1• Integrated MOSFET With PWM to Control

Solenoid Current

– Integrated Sense Resistor for Regulating

Solenoid Current

• Fast Ramp-Up of Solenoid Current to Guarantee

Activation

• Solenoid Current is Reduced in Hold Mode for

Lower Power and Thermal Dissipation

• Peak Current, Keep Time at Peak Current, Hold

Current, and PWM Clock Frequency Can Be Set

Externally. They Can Also Be Operated at

Nominal Values Without External Components.

• Internal Supply Voltage Regulation

– Up to 28-V External Supply

• Protection

– Thermal Shutdown

– Undervoltage Lockout (UVLO)

– Maximum Ramp Time

– Optional STATUS Output

• Operating Temperature Range: –40ºC to 105ºC

• 8-Pin and 14-Pin TSSOP Package Options

2 Applications

• Electromechanical Drivers: Solenoids, Valves,

Relays

• White Goods, Solar, Transportation

3 Description

The DRV120 device is a PWM current driver for

solenoids. The device is designed to regulate the

current with a well-controlled waveform to guarantee

activation and to reduce power dissipation at the

same time. The solenoid current is ramped up fast to

ensure opening of the valve or relay. After the initial

ramping, solenoid current is kept at peak value to

ensure the correct operation, after which it is reduced

to a lower hold level in order to avoid thermal

problems and reduce power dissipation.

The peak current duration is set with an external

capacitor. The current ramp peak and hold levels, as

well as PWM frequency, can independently be set

with external resistors. External setting resistors can

also be omitted, if the default values for the

corresponding parameters are suitable for the

application.

The DRV120 can operate from an external 6-V to

28-V supply.