ISL6522B Datasheet, PDF (13/15 Pages) Intersil Corporation – Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

ISL6522B
ISL6522B DC-DC Converter Application Circuit
Figure 11 shows a DC-DC converter circuit for a
microprocessor application, originally designed to employ
the HIP6006 controller. Given the similarities between the
HIP6006 and ISL6522B controllers, the circuit can be
implemented using the ISL6522B controller without any
modifications. Detailed information on the circuit, including a
complete bill of materials and circuit board description, can
be found in Application Note AN9722. See Intersil’s home
page on the web: http://www.intersil.com.
12V_CC
V_IN
RTN
C1-3
3x 680µF
C17-18
2x 1µF
1206
ENABLE
C13
0.1µF
C12
1µF
R7
1206
10K
VCC
6
SS 3
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MONITOR AND
PROTECTION
RT ₁
R1
SPARE
OSC
U1
REF
ISL6522B
C19
1000pF
2 OCSET ^R6
10 BOOT
9 UGATE
3.01K
Q1
8 ^PHASE
13 ^PVCC
--
FB 5 ⁺⁺
+
+
--
12 ^LGATE
Q2
11 PGND
4
7
R2
1K
C14
COMP
GND
JP1
33pF
C15
R5
0.01µF 15K
C16
COMP
TP1
R3 ^SPARE
1K
R4
SPARE
CR1
4148
PHASE
TP2
C20
0.1µF
L1
CR2
MBR
340
C6-9
4x 1000µF
V_OUT
RTN
Component Selection Notes:
C1-C3 - Three each 680µF 25W VDC, Sanyo MV-GX or equivalent.
C6-C9 - Four each 1000µF 6.3W VDC, Sanyo MV-GX or equivalent.
L1 - Core: micrometals T50-52B; winding: ten turns of 17AWG.
CR1 - 1N4148 or equivalent.
CR2 - 3A, 40V Schottky, Motorola MBR340 or equivalent.
Q1, Q2 - Fairchild MOSFET; RFP25N05
FIGURE 11. DC-DC CONVERTER APPLICATION CIRCUIT
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