UC3843BD1 STMicroelectronics, UC3843BD1 Datasheet - Page 3
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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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THERMAL DATA
ELECTRICAL CHARACTERISTICS ( [note 1] Unless otherwise stated, these specifications apply for
-25 < T
REFERENCE SECTION
OSCILLATOR SECTION
ERROR AMP SECTION
CURRENT SENSE SECTION
Symbol
R
Symbol
V
f
PSRR
f
th j-amb
I
OSC
OSC
V
V
SVR
f
REF
dischg
BW
V
V
I
OSC
G
e
V
V
OSC
REF
SC
I
I
I
I
REF
REF
b
o
o
b
N
2
V
3
/ V
/ T
/ T Temperature Stability
amb
Thermal Resistance Junction-ambient.
< 85 C for UC284XB; 0 < T
Output Voltage
Line Regulation
Load Regulation
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
Frequency
Frequency Change with Volt. V
Frequency Change with Temp.
Oscillator Voltage Swing
Discharge Current (V
Input Voltage
Input Bias Current
A
Unity Gain Bandwidth
Power Supply Rejec. Ratio
Output Sink Current
Output Source Current
V
V
Gain
Maximum Input Signal
Supply Voltage Rejection
Input Bias Current
Delay to Output
VOL
OUT
OUT
High
Low
Parameter
OSC
=2V) T
Description
T
12V
1
(Note 2)
Line, Load, Temperature
10Hz
(note 2)
T
(note 2)
T
T
T
T
(peak to peak)
T
V
V
2V
T
12V
V
V
V
R
V
R
(note 3 & 4)
V
12
amb
j
amb
j
A
J
A
J
A
J
CC
PIN1
FB
PIN2
PIN2
PIN2
PIN2
PIN1
L
L
= 25 C I
= 25 C
= 25°C (R
= 25°C
= 25°C
= T
= T
= T
= 15K
= 15K
I
= 5V
o
= 12V to 25V
Test Conditions
< 70 C for UC384XB; V
V
V
= 2.3V V
= 2.5V
= 2.7V V
= 2.3V;
= 2.7V;
= 5V (note 3)
V
low
low
low
V
i
=
o
f
i
20mA
i
to T
to T
to T
25V (note 3)
4V
125 C,
25V
25V
10KHz T
T
o
to Ground
to Pin 8
= 6.2k, C
= 1mA
high
high
high
PIN1
PIN1
= 5V
1000Hrs
j
= 1.1V
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
T
= 25 C
= 1nF)
max.
Min. Typ. Max. Min. Typ. Max.
4.95 5.00 5.05 4.90 5.00 5.10
2.45 2.50 2.55 2.42 2.50 2.58
2.85
225
-0.5
-30
4.9
7.8
7.5
0.7
0.9
49
48
65
60
–
–
–
2
5
i
= 15V (note 5); R
UC284XB
-100 -180
250
-0.1
150
Minidip
0.2
0.2
1.6
8.3
6.2
0.8
50
52
90
70
12
70
-1
-2
2
3
5
–
1
–
1
1
3
100
3.15 2.85
275
300
5.1
8.8
8.8
1.1
1.1
-10
20
25
25
55
56
-1
1
–
–
4.82
-0.5
225
-30
7.8
7.6
0.7
0.9
49
48
65
60
–
–
–
2
5
SO8
T
UC384XB
150
= 10K; C
-100 -180
250
-0.1
150
0.2
0.5
8.3
6.2
0.8
0.2
1.6
50
52
90
70
12
70
-2
-1
2
3
5
–
–
1
3
1
5.18
3.15
275
300
8.8
8.8
1.1
1.1
-10
20
25
25
55
56
-2
1
–
–
T
= 3.3nF)
Unit
C/W
mV/ C
Unit
MHz
KHz
KHz
KHz
V/V
mV
mV
mV
mA
mA
mA
mA
mA
dB
dB
dB
ns
%
%
V
V
V
V
V
V
V
3/15
V
A
A