ISL6551_15 Datasheet, PDF (24/27 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

ISL6551
Full Bridge Drivers
UPPER1
UPPER2
LOWER1
LOWER2
HIP2100IB
HI HO
LI ^HS
VSS LO
Q1_G
P–
Q3_G
Q3_S
HIP2100IB
HI HO
LI ^HS
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 28A. FULL BRIDGE HIGH CURRENT DRIVERS
Q4_G
FIGURE 28B. 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 28C. FULL BRIDGE PRIMARY CONTROL
FIGURE 28. FULL BRIDGE DRIVERS
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.
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FN9066.6
April 30, 2015