The LM5170QPHPRQ1 controller provides the essential high voltage and precision elements of adual-channel bidirectional converter. It regulates the average current flowing between the highvoltage and low voltage ports in the direction designated by the DIR input signal. The currentregulation level is programmed through analog or digital PWM inputs.
Dual-channel differential current sense amplifiers and dedicated channel current monitorsachieve typical current accuracy of 1%. Robust 5-A half-bridge gate drivers are capable of drivingparallel MOSFET switches delivering 500 W or more per channel. The diode emulation mode of thesynchronous rectifiers prevents negative currents but also enables discontinuous mode operation forimproved efficiency with light loads. Versatile protection features include cycle-by-cycle currentlimiting, overvoltage protection at both HV and LV ports, MOSFET failure detection andover-temperature protection.
An innovative average current mode control scheme maintains constant loop gain allowing asingle R-C network to compensate both buck and boost conversion. The oscillator is adjustable up to500 kHz and can synchronize to an external clock. Multiphase parallel operation is achieved byconnecting two LM5170QPHPRQ1 controllers for 3- or 4-phase operation, or by synchronizing multiplecontrollers to phase-shifted clocks for a higher number of phases. A low state on the UVLO pindisables the LM5170QPHPRQ1 in a low current shutdown mode.
Feature
- Suited for high power industrial dual battery system
- 100-V HV-port and 65-V LV-port max ratings
- 1% Accurate bidirectional current regulation
- 1% Accurate channel current monitoring
- 5-A Peak half-bridge gate drivers
- Support multi-phase operation with stackability
- Diode emulation prevents negative current
- Programmability and flexibility
- Programmable or adaptive dead-time control
- Programmable oscillator frequency with optional synchronization to external clock
- Dual channel enable control inputs
- Analog and PWM current controls
- Programmable peak current limit
- Programmable soft-start timer
- Phase adding or dropping using EN2
- Integrated protection features
- HV and LV port over-voltage protection
- MOSFET failure detect at start-up and circuit breaker control
- Thermal shutdown
