 English |
|
|
|
|
|
|
|
| ISL6551IREC Datasheet, PDF (19/23 Pages) Intersil Corporation – ZVS Full Bridge PWM Controller | |||
| |||
| ◁ |
ISL6551IREC
DISCRETE SOLUTION
⢠Differential Amplifier
⢠VCC undervoltage lockout
⢠Programmable output OV and UV
⢠Programmable output
⢠Status indicators (PGOOD and START)
⢠Precision Reference
⢠Over- temperature protection
⢠Input UV lockout
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+
LOUT
VOUT
COUT
Sâ
FIGURE 20A. CURRENT DOUBLER FILTER
VSS 1
CT 2
RD 3
R_RESDLY 4
R_RA 5
ISENSE 6
PKILIM 7
BGREF 8
R_LEB 9
CS_COMP 10
OUTPUT
REFERENCE CSS 11
(BDAC)
EANI 12
EAI
EAO
EAI 13
EAO 14
ISL6551
28 VDD
27 VDDP1
26 VDDP2
25 PGND
24 UPPER1
23 UPPER2
INPUT
22 LOWER1 UV AND OV
21 LOWER2
20 SYNC1
19 SYNC2
18 ON / OFF
17 DCOK
LED
16 LSTSD
15 SHARE
LSTSD
SHARE
BUS
FIGURE 21. ISL6551IREC CONTROLLER
Secondary Drivers
MIC4421BM
SYNC2
/LOWER1
IN OUT
SYNP
GND
MIC4421BM
SYNC1
/LOWER2
IN OUT
GND
SYNN
FIGURE 22A. INVERTING DRIVERS
VOUTF
LOUT
FCLOCK
VOUT
COUT
FIGURE 20B. CONVENTIONAL 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
ISL6551IREC CONTROLLER
It can be used as a full bridge or push-pull PWM controller. The
QFN package requires less space.
MIC4422BM
SYNC1 IN OUT SYNP
GND
MIC4422BM
SYNC2 IN OUT SYNN
GND
FIGURE 22B. NON-INVERTING DRIVERS
T_SYN
SYN1
SYN2
FSW
IN OUT SYNP
GND
IN OUT SYNN
GND
FIGURE 22C. PRIMARY CONTROL
19
FN6762.0
September 2, 2008
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese