ISL89167
High Speed, Dual Channel, 6A, Power MOSFET Driver With Programmable Delays
Key Features
- Typical ON-resistance <1Ω
- Specified Miller plateau drive currents
- Very low thermal impedance (
0JC = 3°C/W) - Hysteretic Input logic levels for 3.3V CMOS, 5V CMOS, and TTL
- Precision threshold inputs for optional time delays with external RC components
- Instead of RC components for time delays, a resistor can be used to program delays
- 20ns rise and fall time driving a 10nF load.
- NC pins may be connected to ground or VDD for flexible PCB layout options
Description
The ISL89166, ISL89167, and ISL89168 are high-speed, 6A, dual channel MOSFET drivers. These parts are similar to the ISL89160, ISL89161, ISL89162 drivers but use the NC pins for programming the rising edge time delays of the outputs used for dead time control.
As an alternative to using external RC circuits for time delays, the programmable delays on the RDTA and RDTB pins allows the user to delay the rising edge of the respective outputs just by connecting an appropriate resistor value between these pins and ground. The accuracy and temperature characteristics of the time delays are specified freeing the user of the need to select appropriate external resistors and capacitors that traditionally are applied to the logic inputs to delay the output edges.
At high switching frequencies, these MOSFET drivers use very little internal bias currents. Separate, non-overlapping drive circuits are used to drive each CMOS output FET to prevent shoot-thru currents in the output stage.
The start-up sequence is design to prevent unexpected glitches when VDD is being turned on or turned off. When VDD < ~1V, an internal 10kΩ resistor between the output and ground helps to keep the output voltage low. When ~1V
Applications
- Synchronous Rectifier (SR) Driver
- Switch mode power supplies
- Motor Drives, Class D amplifiers, UPS, Inverters
- Pulse Transformer Driver
- Clock/Line Driver
