SP6120B Datasheet, PDF (5/22 Pages) Sipex Corporation – Low Voltage, AnyFETTM, Synchronous ,Buck Controller Ideal for 2A to 10A, High Performance, DC-DC Power Converters

BLOCK DIAGRAM
SS
+
2V
-
ENABLE 2
Reference ^1.25V
V_FB 3% Low ENABLE
V_FB
-
+3%- +
3%
-+ _-
GND 13
SS
V_FB 5
V_FB
+
GM
Error Amplifier
+
-
-
+
COMP 6
Window
Comparator
Logic
ON 100%
OFF 100%
Continuous/
Discontinuous
Program
NFET/PFET ^Logic
9 PROG
RESET
Dominant
PWM Latch
R
Q ^QPWM
S
Driver
Logic
16 BST
Synchronous
Driver
15 GH
14 SWN
11 GL
12 PGND
V_CC 10
2.85 V_ON
2.75 V_OFF
UVLO
-
+
ISP 3
ISN 4
+
x 10
-
430mV
OVC
+
10µs
-
-
+
1V RAMP
F (kHz) = 5.7E6/R_OSC (Ω)
Set Dominant
Fault Latch
S
Q ^FAULT
R
I_CHARGE
0.65V 8 R_OSC
Soft Start
& Hiccup Logic
T_OFF
Zero crossing detect
7
250mV SS
APPLICATION SCHEMATIC
ENABLE
RZ
15k
CP
100pF
CZ
4.7nF
CSS
0.33µF
NMOS High Side Drive
PROG = GND
NC
® BST
ENABLE
GH
ISP
SWN
SP6120B
ISN
GND
V_FB
COMP
PGND
GL
SS
R_OSC
V_CC
PROG
R_OSC
18.7k
MBR0530
CBST
1µF
QT
QB
V_IN
CV_CC
2.2µF
3.3V
V_IN
CB
C_IN
1µF
330µF x 2
RS
CS
22.1k
39nF
L1
2.5µH
DS
RF
5.23k
RI
10k
1.9V
1A to 8A
V_OUT
C_OUT
470µF x 3
Figure 1. Schematic 3.3V to 1.9V Power Supply
QT, QB = FAIRCHILD FDS6690A
L1 = PANASONIC ETQP6F2R5SFA
DS = STMICROELECTRONICS STPS2L25U
C_IN = SANYO 6TPB330M
C_OUT = SANYO 4TPB470M
Date: 5/25/04
SP6120B Low Voltage, AnyFET^TM, Synchronous, Buck Controller
5
© Copyright 2004 Sipex Corporation