PWM测量PWM
High Side,
PHASE
Phase 1 Gate Driver IC Controller
Conduct at 10% duty cycle
VIN
Need low Gate charge (nc)
Control FET
L
VO
Sync. FET
C
Low Side,
Phase N
Conduct at 90% duty cycle Need low RDS(ON)
Efficiency
According to Volt-Second balance: (Vin-Vout)*DTs =Vout *(1-D)Ts We can get D = Vout / Vin
UGATE/LGATE
Adaptive Shoot-Through Protection
Multi-Phase
3-Phase 4-Phase
Phase Voltages
Phase Node
Vout Ripple
V_out Ripple
MOSFET
The power dissipation of Mosfet includes two loss components; conduction loss and switching loss. However, only the upper Mosfet has switching losses, since schottky Diode rectifier clamps the switching node before the synchronous rectifier turns on. The gate-changes losses are dissipated by the gate-driver. Large gate charge increases the ……
