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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
8 7 UVL 1/2 5V REF S/R
VCC
6
5
RS + EA 1/3 1V OSC
1
2
3
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 Tel 86-755-83740369 Fax 86-755-83741418 Ver 5.0 1 of 4 2006-7-10
YOUDA INTEGRATED CIRCUIT
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/. VI(ANA) lSINK(EA) PD Tlead Tstg SYMBOL Vcc Vcc Io VALUE 30 Self Limiting 1 5 -0.3 to +6.3 10 At Tamb25 1.0 300 -65--+150
YD3843
UNIT V V A J V mA W
ELECTRICAL CHARACTERISTICS
(Vcc=15V, RT =10k, CT =3.3nF, Tamb=070, unless otherwise specified) PARAMETER Reference Section Output Voltage Line Regulation Load Regulation Output Noise Voltage Long Term Stability Output Short Circuit Oscillator Section Initial Accuracy Voltage Stability Temp Stability Amplitude Error Amplifier Section Input Voltage Input Bias Current AVOL Unity Gain Bandwidth PSRR Output Sink Current lsink VI(EA) lBIAS 2Vo4V Tj=25(note 2) 12Vcc25V Vpin2=2.7V, Vpin 1=1.1V 60 0.7 60 2 Vpin 1=2.5V 2.42 2.50 -0.3 90 1 70 6 6.0 2.58 -2 V A dB mHz dB mA Vosc f
f/Vcc
SYMBOL VREF
VREF VREF
TEST CONDITIONS Tj=25, Io=1mA
12VIN25V
MIN 4.90
TYP 5.00 6 6 50 5
MAX 5.10 20 25 6 25 -180 57 1
UNIT V mV MV mV mV mA kHz % % V
1lo=20mA 10Hzf10kHz, Tj=25(note 2) Ta=25, 1000Hrs(note 2)
Vose
lsc Tj=25 12Vcc25V TminTATmax(note 2) Vpin 4 peak to peak
-30 47
-100 52 0.2 5 1.7
WuXi YouDa Electronics Co., Ltd
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Website: www.e-youda.com
YOUDA INTEGRATED CIRCUIT
Output Source Current Vout High Vout Low Current Sense Section Gain Maximum Input Signal PSRR Input Bias Current Delay to Output Output Section Output Low Level VOL VOH tR tF lsink=20mA lsink=200mA lsource=20mA lsource=200mA Tj=25, CL=1nF (note 2) Tj=25, CL=1nF(note 2) Vcc=5V, lsink=10mA VTH(ST) VOPR(min) 7.8 7.6 13 12 0.1 1.5 13.5 13.5 50 50 0.7 8.4 8.0 lBIAS Vpin 3=0 to 2V Gv VI(MAX) (note 3, 4) Vpin 1=5V(note 3) 12Vcc25V 2.85 0.9 3 1 70 -2 150 lsource VOH VOL Vpin 2=2.3V, Vpin 1=5V Vpin 2=2.3V, RL=15k to GND Vpin 2=2.7V, Vpin 1=1.1V -0.5 5 -0.8 6 0.7
YD3843
mA V 1.1 V
3.15 1.1
V/V V dB
-10 300 0.4 2.2
A ns V V V V
Output High Level Rise Time Fall Time UVLO Saturation Start Threshold Min. Operating Voltage After Turn On PWM Section Maximum Duty Cycle Minimum Duty Cycle Total Standby Current Start-up Current Operating Supply Current Vcc Zener Voltage
150 150 1.2 9.0 8.4
ns ns V V V
Under-Voltage Lockout Output Section
D(MAX) D(MIN)
95
07
100 0
% %
lST Icc(OPR) Vz Vpin 2=Vpin 3=0V Icc=25mA
0.5 11 34
1 17
mA mA V
WuXi YouDa Electronics Co., Ltd
3 of 4
Website: www.e-youda.com
YOUDA INTEGRATED CIRCUIT
APPLICATION CIRCUIT
YD3843
Vref 4.7 RT 100 1 2 3 4 CT 8 7 6 5 0.1 A 0.1 VCC
Error Amp Adjust 4.7 Isense Adjust 5
1 /1 OUTPUT
OUTLINE DRAWING
WuXi YouDa Electronics Co., Ltd
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