ISL6551IB Intersil, ISL6551IB Datasheet - Page 23

• Manufacturer Part Number: ISL6551IB
• Description: IC CNTRLR PWM FULL BRIDGE 28SOIC
• Manufacturer: Intersil

Specifications of ISL6551IB

• Pwm Type: Current Mode
• Number Of Outputs: 6
• Frequency - Max: 1MHz
• Duty Cycle: 50%
• Voltage - Supply: 10.8 V ~ 13.2 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

(2) 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.
UPPER2
LOWER1
LOWER2
UPPER1
FIGURE 24A. FULL BRIDGE HIGH CURRENT DRIVERS
23
FIGURE 24C. FULL BRIDGE PRIMARY CONTROL
UPPER2
LOWER2
LOWER1
HI
LI
VSS
UPPER1
HIP2100IB
HIP2100IB
HI
LI
VSS
PGND
PGND
HO
HO
LO
HS
LO
HS
ISL6551
Q2_G
P+
Q4_G
Q4_S
Q3_G
Q3_S
Q1_G
P–
HIP2100IB
HIP2100IB
VSS
HI
LI
VSS
HI
LI
HO
HS
LO
HO
HO
HS
HS
LO
LO
FIGURE 24B. FULL BRIDGE MEDIUM CURRENT DRIVERS
Q3_G
UPPER1
UPPER2
Q1G
P–
Q3_S
Q2_G
P+
Q4_G
Q4_S
LOWER1
LOWER2
Q1_G
Q2_G
Q3_S
January 3, 2006
P–
P+
Q3_G
Q4_S
Q4_G
FN9066.5