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SD4870 PDF даташит

Спецификация SD4870 изготовлена ​​​​«Silan Microelectronics» и имеет функцию, называемую «CURRENT MODE PWM CONTROLLER».

Детали детали

Номер произв SD4870
Описание CURRENT MODE PWM CONTROLLER
Производители Silan Microelectronics
логотип Silan Microelectronics логотип 

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SD4870 Даташит, Описание, Даташиты
SD4870_Datasheet
CURRENT MODE PWM CONTROLLER
DESCRIPTION
SD4870 is a current mode PWM controller IC for high performance,
low standby power offline flyback converter application.
In no load or light load condition, the IC operates in Light Load
Mode to reduce switching loss and improve efficiency.
Large value startup resistor could be used in the startup circuit to
minimize the standby current because of low startup current.
SD4870 offers complete protection functions including cycle-by-
cycle over current protection, over load protection, VDD voltage
over voltage and under voltage protection, etc.
Excellent EMI performance is achieved with frequency shuffling
technique and soft switching control at the totem pole gate driver
output.
SOT-23-6L
DIP-8-300-2.54 SOP-8-225-1.27
FEATURES
* Frequency shuffling to improve EMI performance
* Light Load Mode for minimum standby power
* External programmable switching frequency
* 3uA low startup current
* Internal LEB circuit
* VDD over voltage and under voltage protection
* Gate output maximum voltage clamp
* Current limiting
* Over load protection
* SOT-23-6L/SOP8/DIP8 package
APPLICATIONS
* Battery Chargers
* Adapters
* Set-Top Box Power Supplies
ORDERING INFORMATION
Part No.
SD4870TR
SD4870A
SD4870C
SD4870CTR
Package
SOT-23-6L
DIP-8-300-2.54
SOP-8-225-1.27
SOP-8-225-1.27
Marking
4870
SD4870A
SD4870C
SD4870C
Material
Pb free
Pb free
Pb free
Pb free
Packing
Tape & Reel
Tube
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.3 2010.12.29
Page 1 of 9









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SD4870 Даташит, Описание, Даташиты
BLOCK DIAGRAM
SD4870_Datasheet
ABSOLUTE MAXIMUM RATINGS
Characteristics
VDD Voltage
FB Voltage
SENSE Voltage
RI Voltage
Junction Temperature
Lead Temperature
Storage Temperature
Symbol
VVDD
VFB
VSENSE
VRI
Tj
TL
Tstg
Rating
25
-0.3~6
-0.3~6
-0.3~6
-20~150
260
-55~160
Unit
V
V
V
V
°C
°C
°C
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.3 2010.12.29
Page 2 of 9









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SD4870 Даташит, Описание, Даташиты
SD4870_Datasheet
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25°C)
Characteristics
VDD
Startup Current
Operation Current
UVLO Threshold Voltage
UVLO Hysteresis Voltage
VDD Clamp Voltage
Feedback
PWM Gain
FB Open Loop Voltage
FB Short Circuit Current
FB OL Threshold Voltage
OL Debounce Time
FB Input Impedance
Maximum Duty Cycle
Current Sense
LEB Time
SENSE Input Impedance
OC Control Delay
OC Detection Threshold
Switching Frequency
Ocsillation Frequency
Frequency Stability With
VDD
RI External Resistance
Range
Light Load Mode
Frequency
Frequency Shuffling Range
Gate Driver
Output Low Level
Output High Level
Output Clamp Voltage
Level
Output Rising Time
Output Falling Time
Symbol
Test Condition
IVDD_ST
IVDD
VUVLO
VUVLOH
VVDD_CLP
VDD=12 V,RI=100kΩ
VDD=16V, VFB =3V,
RI=100kΩ
IVDD =10mA
AVCS
VFB_OPEN
IFB_SHORT
VFB_OL
TD_OL
ZFB_IN
DMAX
ΔVFB /ΔVSENSE
FB short connected to
ground
VDD=16V, RI=100kΩ
VFB =3V,VSENSE =0V
TLEB
ZSENSE_IN
TOC
VSENSE_OC
RI=100kΩ
fS
ΔfS_VDD
RI=100kΩ
VDD=12~25V,RI=100kΩ
RRI_RANGE
fS_LLM
ΔfS_SHUF
RI=100kΩ
VOL
VOH
VDD=16V, IO=-20mA
VDD=16V, IO=20mA
VOH_CLAMP
TR VDD=16V,CL=1nF
TF VDD=16V,CL=1nF
Min.
--
--
13.3
--
--
--
4.5
0.8
--
4
--
--
--
--
0.7
60
--
50
--
-3
--
10
--
--
--
Typ. Max.
3 20
2 --
14.3 15.3
6.3 --
21.5 --
2 --
4.8 5
1 1.2
3.8 --
35 --
6 --
75 --
300 --
85 --
75 --
0.75 0.8
65 70
5 --
100 150
22 --
-- 3
-- 0.8
-- --
13 --
220 --
70 --
Unit
μA
mA
V
V
V
V/V
V
mA
V
ms
k
%
ns
k
ns
V
kHz
%
k
kHz
%
V
V
V
ns
ns
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.3 2010.12.29
Page 3 of 9










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Номер в каталогеОписаниеПроизводители
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