Fairchild Semiconductor KA3883D, KA3883, KA3882D, KA3885D, KA3885 Datasheet
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KA3882/3/4/5 |
SMPS CONTROLLER |
CURRENT MODE PWM CONTROLLER
The KA3882/3/4/5 are fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totempole output for driving a POWER MOSFET. Also KA 3882/3/4/5 provide low start up current below 0.3mA and short shutdown delay time typ. 100ns.
The KA3882 and KA3884 have UVLO threshold of 1 6V(on) and 10V(off).
The KA3883 and KA3885 are 8.4V(on) and 7.6V(off).
The KA3882 and KA3883 can operate within 100% duty cycle. The KA3884 and KA3885 within 50% by using T Flip-Flop.
FEATURES
∙Low Start Current 0.2mA (typ)
∙Operating Range Up To 500KHz
∙Cycle by Cycle Current Limiting
∙Under Voltage Lock Out With Hysteresis
∙Short Shutdown Delay Time: typ.100ns
∙High Current Totempole Output
∙Output Swing Limiting: 22V
8 DIP
8 SOP
ORDERING INFORMATION
Device |
Package |
Operating Temperature |
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KA388X |
8 DIP |
0 ~ + 85Î |
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KA388XD |
8 SOP |
0 ~ + 85Î |
BLOCK DIAGRAM
Rev. B
©1999 Fairchild Semiconductor Corporation
KA3882/3/4/5 |
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SMPS CONTROLLER |
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ABSOLUTE MAXIMUM RATINGS |
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Characteristic |
Symbol |
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Value |
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Unit |
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Supply Voltage |
VCC |
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30 |
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V |
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Output Current |
IO |
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+ 1 |
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A |
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Analog Inputs (pin 2, 3) |
VI(ANA) |
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- 0.3 to 6.3 |
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V |
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Error Amp. Output Sink Current |
ISINK(EA) |
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10 |
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mA |
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Power Dissipation |
PD |
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1 |
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W |
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ELECTRICAL CHARACTERISTICS |
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(VCC = 15V, RT = 10K`, CT = 3.3nF, TA = 0Îto + 85Î, Unless otherwise specified) |
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Characteristic |
Symbol |
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Test Conditions |
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Min |
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Typ |
Max |
Unit |
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REFERENCE SECTION |
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Output Voltage |
VREF |
TJ = 25Î, IO = 1mA |
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4.9 |
5.0 |
5.1 |
V |
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Line Regulation |
LVREF |
VCC = 12V to 25V |
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6 |
20 |
mV |
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Load Regulation |
LVREF |
IO = 1mA to 20mA |
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6 |
25 |
mV |
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Output Short Circuit |
ISC |
Ta = 25Î |
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- 100 |
- 180 |
mA |
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OSILLATOR SECTION |
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Initial Accuracy |
FOSC |
TJ = 25Î |
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47 |
52 |
57 |
KHz |
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Voltage Stability |
STV |
VCC = 12V to 25V |
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0.2 |
1 |
% |
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Amplitude |
VOSC |
VPIN4, Peak to Peak |
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ï |
1.7 |
ï |
V |
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Discharge Current |
IDISCHG |
TJ = 25Î, Pin4 = 2V |
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7.8 |
8.3 |
8.8 |
mA |
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CURRENT SENSE SECTION |
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Gain |
GV |
(NOTE 2, 3) |
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2.85 |
3 |
3.15 |
V/V |
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Maximum Input Signal |
VI(MAX) |
VPIN1 = 5V(NOTE 2) |
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0.9 |
1.0 |
1.1 |
V |
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PSRR |
PSRR |
VCC = 12V to 25V |
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ï |
70 |
ï |
dB |
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(NOTE 1, 2) |
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Input Bias Current |
IBIAS |
ï |
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- 2 |
-10 |
uA |
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Delay to Output |
TD |
VPIN3 = 0V to 2V (NOTE1) |
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ï |
100 |
200 |
ns |
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