參數(shù)資料
型號(hào): S-8340B
廠商: Seiko Instruments Inc.
英文描述: PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制,高頻步升開關(guān)穩(wěn)壓器-控制器)
中文描述: PWM控制高頻升壓型開關(guān)穩(wěn)壓器控制器(脈寬調(diào)制控制,高頻步升開關(guān)穩(wěn)壓器-控制器)
文件頁數(shù): 20/38頁
文件大?。?/td> 420K
代理商: S-8340B
PWM Control & PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers
Rev.1.00
S-8340/8341 Series
Seiko Instruments Inc.
19
(2) Using a bipolar transistor
VSS
VOUT
VOUT
SD
C
S
R
S
R1
R2
C
C
CL
ON /OFF
PWM/PFM switching
control circuit
Phase
Triangular wave
oscillation circuit
VDD
L
Cb
EXT
Voltage/current
reference
Power-off
circuit
VIN
CVREF
1 point ground
CSS
NPN
bipolar
Soft-start
circuit
IC internal power
120mV
RSENSE
SENSE
PWMcomparator
Error amplifier
VREF=1.0V
Figure 12 Block diagram <Output voltage fixed output type>
R
S
C
S
SD
ON /OFF
PWM/PFM switching
control circuit
Phase
Triangular wave
oscillation circuit
VDD
L
EXT
Voltage/current
reference
Power-off
circuit
VIN
1 point ground
CVREF
CSS
NPN
bipolar
Soft-start
circuit
IC internal power
120mV
RSENSE
SENSE
PWMcomparator
Error amplifier
VREF=1.0V
VOUT
FB
VSS
CFB
CL
RFB1
RFB2
Cb
Figure 13 Block diagram <Output voltage external setting type>
Precautions:
Install the external capacitors, diode, coil, and other peripheral components as close to the IC as
possible, and secure grounding at a single location.
Any switching regulator intrinsically produces a ripple voltage and spike noise, which are largely dictated
by the coil and capacitors in use. When designing a circuit, first test them on actual power equipment.
Make sure that dissipation of the switching transistor will not surpass the allowable power dissipation of
the package. (especially at the time of high temperature)
相關(guān)PDF資料
PDF描述
S-8341 PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制,高頻步升開關(guān)穩(wěn)壓器-控制器)
S-8341A PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制,高頻步升開關(guān)穩(wěn)壓器-控制器)
S-8341B PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制,高頻步升開關(guān)穩(wěn)壓器-控制器)
S-8420AF BATTERY BACKUP IC FOR 1-CHIP CPU
S-8420BF BATTERY BACKUP IC FOR 1-CHIP CPU
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