UC3843BD1 STMicroelectronics, UC3843BD1 Datasheet - Page 6
![IC CTLR PWM HP CURR MODE SO-8](/photos/1/38/13851/497-8-soic_sml.jpg)
UC3843BD1
Manufacturer Part Number
UC3843BD1
Description
IC CTLR PWM HP CURR MODE SO-8
Manufacturer
STMicroelectronics
Datasheet
1.UC3845BD1013TR.pdf
(15 pages)
Specifications of UC3843BD1
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
8.2 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
500kHz
Number Of Pwm Outputs
1
On/off Pin
No
Adjustable Output
No
Switching Freq
500KHz
Operating Supply Voltage (max)
30V
Output Current
1000A
Synchronous Pin
No
Rise Time
50ns
Fall Time
50ns
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
8
Package Type
SO
Duty Cycle (max)
100 %
Output Voltage
5.1 V
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 150 C
Minimum Operating Temperature
- 40 C
Topology
Boost or Flyback or Forward
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
STUC3843BD1
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UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
Figure 4: Oscillator Discharge Current vs. Tem-
Figure 6: Error Amp Open-Loop Gain and
Figure 8: Reference Voltage Change vs.
6/15
(dB)
I
-20
(mA)
80
60
40
20
dischg
60
50
40
30
20
10
0
8.5
8.0
7.5
7.0
0
10
0
-55
perature.
Phase vs. Frequency.
Source Current.
T
100
20
A
-25
=125˚C
40
1K
0
Gain
25
10K
60
T
A
50
=-40˚C
V
V
R
T
100K
V
80
A
i
O
L
V
V
=15V
=100K
=25˚C
i
=2V to 4V
=15V
i
OSC
=15V
75
100 I
=2V
1M
Phase
D95IN337
D95IN339
100 T
D95IN335
ref
f(Hz)
(mA)
A
(˚C)
120
150
180
30
60
90
Figure 5: Maximum Output Duty Cycle vs. Tim-
Figure 7: Current Sense Input Threshold vs. Er-
Figure 9: Reference Short Circuit Current vs.
D
(%)
max
90
80
70
60
50
40
(mA)
100
I
V
1.0
0.8
0.6
0.4
0.2
0.0
SC
90
80
70
60
50
(V)
0.8
th
-55
0
1
T
ing Resistor.
ror Amp Output Voltage.
Temperature.
V
A
-25
i
=125˚C
=15V
I
T
dischg
A
=25˚C
2
=7.5mA
0
T
A
2
=-40˚C
25
I
dischg
4
=8.8mA
50
3
V
R
i
L
=15V
75
0.1
6
V
C
T
A
i
T
=15V
=25˚C
=3.3nF
100 T
D95IN340
D95IN338
5
V
D95IN336
O
A
(V)
(˚C)
R
T
(K )