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UC3843D 데이터시트 PDF




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부품번호 UC3843D 기능
기능 Fixed Frequency Current Mode PWM Controller
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UC3843D 데이터시트, 핀배열, 회로
UC3843
Fixed Frequency Current Mode PWM Controller
DESCRIPTION
UC3843 is a fixed frequency current-mode PWM controller.
It is specially designed for Off Line and DC-to-DC converter
applications with minimal external component. This
integrated circuit features a trimmed oscillator for precise
duty cycle control, a temperature compensated reference, a
high gain error amplifier, a current sensing comparator, and
a high current totem pole output ideally suited for driving a
power MOSFET.
The device is protective features consisting of input and
reference under-voltage lockouts each with hysteresis,
cycle-by-cycle current limiting.
PIN CONFIGURATION
Compensation
Voltage Feedback
Current Sense
RT/CT
1
2
3
4
8 Vref
7 VCC
6 Output
5 GND
(Top View)
FEATURES
● Automatic Feed Forward Compensation
● High Current Totem Pole Output
● Internally Trimmed Bandgap Reference
● Undervoltage Lockout with Hysteresis
● Low Start Up Current
● Optimized for offline converter
● Double pulse suppression
● Current mode operation to 500kHz
APPLICATION
● Wireless Base Station Power
● Telecom and Datacom Power
● Industrial Power Systems
● PC Power Supplies
ORDERING INFORMATION
Temperature Range
0°C to +70°C
Package
DIP8L
SOP8L
Pb-Free
Orderable
Device
UC3843D
UC3843P
Package Qty
75Units/Tube
50Units/Tube
Jun. 2008
Rev 1.0
1




UC3843D pdf, 반도체, 판매, 대치품
ELECTRICAL CHARACTERISTICS
Parameter
Oscillator Section
Frequency
Symbol
Test Conditions
VCC = 15V, TJ = 25°C
RT=10K¡, CT = 3.3nF
fosc
VCC = 15V,
TA = TLOW to THIGH,
RT = 10K¡CT = 3.3nF
Frequency Change
with Voltage
VCC = 12V to 25V,
Δ fosc/ΔV TA= TLOWto THIGH,
RT=10kΩ, CT=3.3nF
Discharge Current
Idisch
TJ = 25°C
Vosc = 2.0V
VCC = 15V TA = TLOW to
THIGH
Error Amplifier Section
Voltage Feedback
Input
VFB VO = 2.5V,VCC = 15V,
TA = TLOW to THIGH
Input Bias Current
IIB
VFB = 2.7V,VCC = 15V,
TA = TLOW to THIGH
Open Loop Voltage
Gain
AVOL
VO = 2.0V to 4.0V,
VCC = 15V,
TA = TLOW to THIGH
Unity Gain Bandwidth
BW
VCC = 15V,
TA = TLOW to THIGH
Power Supply
Rejection Ratio
PSRR
VCC = 12V to 25V,
TA = TLOW to THIGH
Output
Current
Output
Voltage
Swing
Sink
Source
High
State
Low
State
ISINK
VO = 1.1V, VFB = 2.7V,
VCC = 15V,
TA = TLOW to THIGH
ISOURCE
VO = 5.0V, VFB = 2.3V,
VCC = 15V,
TA = TLOW to THIGH
VFB = 2.7V, VCC = 15V
VOH RL(GND) = 15KΩ,
TA = TLOW to THIGH
VFB = 2.7V, VCC = 15V
VOL RL(5.0) = 15KΩ,
TA = TLOW to THIGH
Min
47
46
7.5
7.2
2.42
65
0.7
60
2.0
-0.5
5.0
UC3843
Max Unit
57
kHz
60
1.0 %
9.3
mA
9.5
2.58
-2.0
V
μA
dB
MHz
dB
mA
V
1.1
Jun. 2008
Rev 1.0
4

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UC3843D 전자부품, 판매, 대치품
UC3843
TYPICAL PERFORMANCE CHARACTERISTICS(CONTINUE)
100 0
VCC = 15 V
80
Gain
VO = 2.0 V to 4.0 V 30
RL = 100 K
TA = 25°C
60 60
40 90
Phase
20 120
0 150
-20
10 100 1.0k 10k 100k 1.0M
f, FREQUENCY (Hz)
Figure 8. Error Amp Open Loop Gain and
Phase versus Frequency
180
10M
1.2
VCC= 15V
1.0
0.8 TA= 25°C
0.6
TA = 125°C
0.4 TA= -55°C
0.2
0
0 2.0 4.0 6.0 8.0
VO, ERROR AMP OUTPUT VOLTAGE (V)
Figure 9. Current Sense Input Threshold
versus Error Amp Output Voltage
0
VCC=15V
-4.0
-8.0
-12
-16
-20
-24
0
TA =125°C
TA =25°C
TA=-55°C
20 40 60 80 100
Iref, REFERENCE SOURCE CURRENT (mA)
Figure 10. Reference Voltage Change
versus Source Current
120
110
VCC = 15 V
RL 0.1Ω
90
70
50
-55 -25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 11. Reference Short Circuit Current
versus Temperature
VCC = 15 V
IO = 1.0 mA to 20 mA
TA = 25°C
VCC =12V to 25V
TA = 25°C
2.0 ms/DIV
Figure 12. Reference Load Regulation
Jun. 2008
Rev 1.0
2.0 ms/DIV
Figure 13. Reference Line Regulation
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