ISL6551_15 Datasheet, PDF (22/27 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller

ISL6551
The Integrated Solution- Is much simpler than a discrete
solution. Over-temperature protection and input undervoltage
lockout can be added for better system protection and
performance.
The Discrete Solution- Requires a significant number of
components to implement the features that the ISL6550 can
provide.
Output Filter
S+
L_OUT
VOUT
C_OUT
V_OUTF
L_OUT
F_CLOCK
V_OUT
C_OUT
S–
FIGURE 24A. CURRENT DOUBLER FILTER
FIGURE 24B. CONVENTIONAL FILTER
FIGURE 24. OUTPUT FILTER
Current Doubler Filter- Two inductors are needed, but they can be
integrated and coupled into one core. Each inductor carries half of
the load operating at the switching frequency.
Conventional Filter- One inductor is needed. The inductor carries
all the load operating at two times the switching frequency.
Controller
VSS ₁
CT ₂
RD 3
R_RESDLY ₄
R_RA 5
ISENSE 6
PKILIM ₇
BGREF 8
R_LEB 9
OUTPUT ^{CS_COMP 10}
REFERENCE ^CSS 11
(BDAC)
EANI ₁₂
EAI
EAO
EAI ₁₃
EAO ₁₄
ICL6551
SOIC
28 VDD
27 ^VDDP1
26 ^VDDP2
25 PGND
24 ^UPPER1
23 ^UPPER2
22 ^LOWER1
INPUT
UV & OV
21 ^LOWER2
20 SYNC1
19 ^SYNC2
18 ^{ON / OFF}
17 ^DCOK
LED
16 LSTSD
15 ^SHARE
LSTSD
SHARE
BUS
FIGURE 25. ISL6551 CONTROLLER
ISL6551 Controller- It can be used as a full bridge or push-pull
PWM controller. Secondary Drivers.
MIC4421BM
SYNC2
/LOWER1
IN OUT
GND
SYNP
MIC4421BM
SYNC1
/LOWER2
IN OUT
GND
SYNN
FIGURE 26A. INVERTING DRIVERS
MIC4422BM
SYNC1 IN OUT SYNP
GND
MIC4422BM
SYNC2 IN OUT SYNN
GND
FIGURE 26B. NONINVERTING DRIVERS
T_SYN
SYN1
IN OUT SYNP
GND
SYN2
f_SW
IN OUT SYNN
GND
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SYN1
SYN2
IC
INVERTING
SYNC2/LOWER1
SYNC1/LOWER2
MIC4421BM
NON INVERTING
SYNC1
SYNC2
MIC4422BM
FIGURE 26C. PRIMARY CONTROL
FN9066.6
April 30, 2015