ISL6551 Datasheet, PDF (22/26 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

ISL6551
Primary FET Drivers
(1) PUSH-PULL DRIVERS
LOWER1
LOWER2
Q3_G
Q3_S
Q4_S
LOWER1
LOWER2
HIP2100IB
HI HO
LI HS
VSS LO
Q3_G
Q3_S
Q4_G
Q4_S
Q4_G
FIGURE 23A. PUSH-PULL MEDIUM CURRENT DRIVERS
FIGURE 23B. PUSH-PULL HIGH CURRENT DRIVERS
LOWER1
LOWER2
HIP2100IB
HI ^HO
LI ^HS
VSS LO
Q3_G
Q3_S
Q4_G
PGND
Q4_S
FIGURE 23C. PUSH-PULL PRIMARY CONTROL
Push-Pull Medium Current Drivers - Upper drivers are not
used. No external drivers are required. Secondary control.
Operate at the switching frequency.
Push-Pull High Current Drivers - Upper drivers are not
used. External high current drivers are required and less
power is dissipated in the ISL6551 controller. Secondary
control. Operate at the switching frequency.
Push-Pull Primary Control - Upper drivers are not used.
Both lower drivers can directly drive the power switches.
External drivers are required in high gate capacitance
applications.
22
FN9066.4
July 8, 2005