s-8541c32fn-iirt2g Seiko Instruments Inc., s-8541c32fn-iirt2g Datasheet - Page 18
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s-8541c32fn-iirt2g
Manufacturer Part Number
s-8541c32fn-iirt2g
Description
Step-down, 600 Khz Pwm Control Or Pwm/pfm Switchable Switching Regulator Controller
Manufacturer
Seiko Instruments Inc.
Datasheet
1.S-8541C32FN-IIRT2G.pdf
(36 pages)
- Current page: 18 of 36
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18
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8540/8541 Series
Standard Circuits
1. Fixed output voltage (Pch MOS FET)
2. Feed back type (Pch MOS FET)
Caution The above connection diagram and constant will not guarantees successful operation.
One point ground
One point ground
V
IN
V
IN
Perform through evaluation using the actual application to set the constant.
Tr
Tr
SD
SD
C
IN
C
IN
VIN
EXT
EXT
VIN
Power for IC
Power for IC
ON/OFF
ON/OFF
Shu tdo wn
circuit
Shutdown soft start
c irc uit
Seiko Instruments Inc.
s oft start
Figure 14
T riangular wave
oscillation circuit
Figure 13
T riangular wave
oscillation circuit
PWM comparator
PWM c omparator
PW M, PW M/PFM
switching control
circuit
PW M, PW M/PFM
switching control
circuit
V
V
ON/OFF
−
+
ON/OFF
−
+
Phase
comp ensation
circuit
Voltage/current
referenc e
Phase
compe nsation
circuit
Voltage/ current
referenc e
V
Error amplifier
RE F
L
V
Error amplifier
L
RE F
=1.0 V
−
+
=1. 0 V
−
+
CVREF
SENSE
CVREF
125m V
SENSE
+
−
+
−
R
SEN SE
125mV
C
VSS
FB
VOUT
FB
R
SEN SE
VOUT
VSS
Rev.3.2
R
R
A
B
C
C
OUT
OUT
_00
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