ISL6551_06 Datasheet, PDF (23/26 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

ISL6551
(2) FULL BRIDGE DRIVERS
UPPER1
UPPER2
LOWER1
LOWER2
HIP2100IB
HI HO
HS
LI
VSS LO
Q1_G
P–
Q3_G
Q3_S
HIP2100IB
HI HO
HS
LI
VSS LO
Q2_G
P+
Q4_G
Q4_S
UPPER1
UPPER2
LOWER1
LOWER2
Q1_G
P–
P+
Q2_G
Q3_G
Q3_S
Q4_S
FIGURE 24A. FULL BRIDGE HIGH CURRENT DRIVERS
Q4_G
FIGURE 24B. FULL BRIDGE MEDIUM CURRENT DRIVERS
UPPER1
LOWER1
PGND
HIP2100IB
HI HO
HS
LI
VSS LO
Q1G
P–
Q3_G
Q3_S
UPPER2
LOWER2
PGND
HIP2100IB
HI HO
HS
LI
VSS LO
Q2_G
P+
Q4_G
Q4_S
FIGURE 24C. FULL BRIDGE PRIMARY CONTROL
Full Bridge High Current Drivers - External high current
drivers are required and less power is dissipated in the
ISL6551 controller. Secondary control. Operate at the
switching frequency.
Full Bridge Medium Current Drivers - No external drivers
are required. Secondary control. Operate at the switching
frequency.
Full Bridge Primary Control - Lower drivers can directly
drive the power switches, while upper drivers require the
assistance of level-shifting circuits such as a pulse
transformer or Intersil’s HIP2100 half-bridge driver. External
high current drivers are not required in medium power
applications, but level-shifting circuits are still required for
upper drivers. Operate at the switching frequency.
23
FN9066.5
January 3, 2006