ISL6522_06 Datasheet, PDF (12/15 Pages) Intersil Corporation – Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

ISL6522
ISL6522 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 ISL6522 controllers, the circuit can be
12V_CC
V_IN
RTN
C1-3
3x 680µF
implemented using the ISL6522 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.
C17-18
2x 1µF
1206
ENABLE
C13
0.1µF
C12
1µF
R7
1206
10K
VCC
6
SS 3
14
MONITOR AND
PROTECTION
RT ₁
R1
SPARE
OSC
U1
REF
ISL6522
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
R4
1K
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
12
FN9030.8
March 10, 2006