CONTROL CIRCUITS. YD3843 Datasheet

YD3843 Datasheet PDF, Equivalent


Part Number

YD3843

Description

CURRENT MODE PWM CONTROL CIRCUITS

Manufacture

Wuxi Youda electronics

Total Page 4 Pages
PDF Download
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YD3843 Datasheet
www.DataSheet4U.com
YOUDA INTEGRATED CIRCUIT
YD3843
CURRENT MODE PWM CONTROL CIRCUITS—YD3843
DESCRIPTION
The YD3843 provides the necessary features to implement off-line or DC to DC fixed frequency current mode
control schemes with a minimal external parts count.
FEATURES
*Optimized for off-line and DC to DC converts
*Low start up current(<1mA)
*Automatic feed forward compensation
*Pulse-by-Pulse current limiting
*Enhanced load response characteristic
*Under-voltage lookout with hysteresis.
*Double pulse Suppression
*High current totem pole output
*Internally trimmed band-gap reference
*500kHz operation
*Low Ro error amp
BLOCK DIAGRAM
8765
1/2
5V
REF
S/R
UVL
VCC
+ EA
-
12
1/3
1V
3
RS
OSC
4
WuXi YouDa Electronics Co., Ltd
Add: No.5 Xijin Road, National Hi-Tech Industrial Development Zone, Wuxi Jiangsu China
Tel: 86-510-85205117 86-510-85205106 Fax: 86-510-85205110 Website: www.e-youda.com
SHENZHEN OFFICE Tel86-755-83740369
Fax86-755-83741418
Ver 5.0
1 of 4
2006-7-10

YD3843 Datasheet
www.DataSheet4U.com
YOUDA INTEGRATED CIRCUIT
YD3843
ABSOLUTE MAXIMUM RATINGS(Tamb=25)
PARAMETER
Supply Voltage(Low impedance Source)
Supply Voltage(Icc30mA)
Output Current
Output Energy(Capacitive Load)
Analog Inputs(pin 2, 3)
Error Amplifier Output Sink Current
Power Dissipation
Lead Temperature
Storage Temperature
Note 1:Ta25, PD derated with 8mW/.
SYMBOL
Vcc
Vcc
Io
VI(ANA)
lSINK(EA)
PD
Tlead
Tstg
VALUE
30
Self Limiting
±1
5
-0.3 to +6.3
10
At Tamb251.0
300
-65+150
UNIT
V
V
A
μJ
V
mA
W
ELECTRICAL CHARACTERISTICS
(Vcc=15V, RT =10kΩ, CT =3.3nF, Tamb=0℃~70, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP
Reference Section
Output Voltage
VREF
Tj=25, Io=1mA
4.90 5.00
Line Regulation
Load Regulation
Output Noise Voltage
VREF
VREF
Vose
Long Term Stability
12VIN25V
1lo=20mA
10Hzf10kHz,
Tj=25(note 2)
Ta=25, 1000Hrs(note
2)
6
6
50
5
Output Short Circuit
lsc
-30 -100
Oscillator Section
Initial Accuracy
Voltage Stability
Temp Stability
f
f/Vcc
Tj=25
12Vcc25V
TminTATmax(note
2)
47
52
0.2
5
Amplitude
Vosc Vpin 4 peak to peak
1.7
Error Amplifier Section
Input Voltage
VI(EA)
Vpin 1=2.5V
2.42 2.50
Input Bias Current
AVOL
lBIAS
2Vo4V
-0.3
60 90
Unity Gain
Bandwidth
Tj=25(note 2)
0.7 1
PSRR
12Vcc25V
60 70
Output Sink Current
lsink
Vpin2=2.7V,
Vpin 1=1.1V
26
MAX UNIT
5.10 V
20 mV
25 MV
6 mV
25 mV
-180 mA
57 kHz
1%
%
V
2.58 V
-2 μA
dB
6.0 mHz
dB
mA
WuXi YouDa Electronics Co., Ltd
2 of 4
Website: www.e-youda.com


Features Datasheet pdf www.DataSheet4U.com YOUDA INTEGRATED CI RCUIT YD3843 CURRENT MODE PWM CONTROL CIRCUITS—YD3843 DESCRIPTION The YD38 43 provides the necessary features to i mplement off-line or DC to DC fixed fre quency current mode control schemes wit h a minimal external parts count. FEAT URES *Optimized for off-line and DC to DC converts *Low start up current(<1mA) *Automatic feed forward compensation * Pulse-by-Pulse current limiting *Enhanc ed load response characteristic *Under- voltage lookout with hysteresis. *Doubl e pulse Suppression *High current totem pole output *Internally trimmed band-g ap reference *500kHz operation *Low Ro error amp BLOCK DIAGRAM 8 7 UVL 1/2 5V REF S/R VCC 6 5 R S + EA 1/3 1V OSC 1 2 3 4 WuXi YouDa Electronics Co ., Ltd Add: No.5 Xijin Road, National H i-Tech Industrial Development Zone, Wux i Jiangsu China Tel: 86-510-85205117 86 -510-85205106 Fax: 86-510-85205110 Webs ite: www.e-youda.com SHENZHEN OFFICE Te l: 86-755-83740369 Fax: 86-755-83741418 Ver 5.0 1 of 4 2006-7-10 .
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