ISL6539 Intersil Corporation, ISL6539 Datasheet - Page 8

• Manufacturer Part Number: ISL6539
• Description: Wide Input Range Dual PWM Controller with DDR Option
• Manufacturer: Intersil Corporation

Block Diagram
SOFT1
ISEN1
BOOT1
UGATE1
PHASE1
PGND1
LGATE1
VCC
VSEN1
OCSET1
140Ω
+ 0.9V
REF
CURRENT
SAMPLE
300kΩ
OCSET1
1/2.9
500kΩ
+
+
-
ADAPTIVE DEAD-TIME
0.9V REFERENCE
DIODE EMULATION
V/I SAMPLE TIMING
-
+
1.25pF
ERROR AMP 1
1MΩ
ISEN1
CURRENT
1/33.1
SAMPLE
4.4kΩ
16.7pF
-
+
-
+
OVERCURRENT FAULT
REQUIRED TO LATCH
SAME STATE FOR
8 CLOCK CYCLES
PGOOD
OV UV
PG1
PWM1
OC1
EN1
DDR
0
1
PWM CHANNEL PHASE CONTROL
DUTY CYCLE RAMP GENERATOR
EN1
1
1
VIN
EN2
1
1
OC1 DDR
BIAS SUPPLIES
FAULT LATCH
REFERENCE
SOFT-START
VCC
DDR MODE
CONTROL
ENABLE
5V
VIN = GND
DDR
POR
VIN = 5V
GND
VIN
15.0V
OC2
VCC
CH1 CH2 φ
180°
90°
0°
OVERCURRENT FAULT
REQUIRED TO LATCH
EN2
8 CLOCK CYCLES
SAME STATE FOR
DDR = 0
OC2
PWM2
PGOOD
REF/PG2
OV UV
DDR = 1
-
+
-
+
4.4kΩ
16.7pF
CURRENT
SAMPLE
ERROR AMP 2
ADAPTIVE DEAD-TIME
1/33.1
DIODE EMULATION
V/I SAMPLE TIMING
ISEN2
0.9V REFERENCE
1.25pF
1MΩ
BUFFER AMP
DDR VREF
+
-
+
-
500kΩ
-
+
+
OCSET2
1/2.9
(200kΩ, DDR = 1)
300kΩ
CURRENT
SAMPLE
DDR = 0
+
DDR = 0
140Ω
0.9V
REF
REFERENCE
DDR VTT
DDR = 1
UGATE2
PHASE2
OCSET2
LGATE2
BOOT2
PGND2
VSEN2
SOFT2
DDR = 1
+
ISEN2
-
VCC