UC2843BN STMicroelectronics, UC2843BN Datasheet - Page 7

IC CTRLR PWM CURR-MODE 8-MINIDIP

UC2843BN

Manufacturer Part Number
UC2843BN
Description
IC CTRLR PWM CURR-MODE 8-MINIDIP
Manufacturer
STMicroelectronics
Datasheet

Specifications of UC2843BN

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
-25°C ~ 85°C
Package / Case
8-DIP (0.300", 7.62mm)
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
Through Hole
Pin Count
8
Package Type
PDIP
Duty Cycle (max)
100 %
Output Voltage
4.95 V to 5.05 V
Mounting Style
Through Hole
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
Contains lead / RoHS non-compliant
Other names
497-3678

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Figure 10: Output Saturation Voltagevs. Load
Figure 12: Output Waveform.
Figure 14: Oscillator and Output Waveforms.
10%
90%
V
(V)
-1
-2
3
2
1
0
sat
0
R
C
T
T
V
80 s Pulsed Load 120Hz Rate
V
i
Current.
=15V
T
i
A
=-40˚C
T
200
A
=25˚C
Sink Saturation
(Load to V
Source Saturation
(Load to Ground)
8
4
50ns/DIV
400
PWM
I
D
i
)
CLOCK
T
OSCILLATOR
T
A
600
A
=25˚C
5V REG
=-40˚C
7
5
V
C
T
D95IN341
GND
A
i
V
GND
L
=15V
i
I
= 1.0nF
= 25°C
O
(mA)
6
Figure 11: Supply Current vs. Supply Voltage.
Figure 13: Output Cross Conduction
OUTPUT
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
I
(mA)
V
CC
20
15
10
O
I
5
0
i
0
OUTPUT
OUTPUT
CT
CT
10
LARGE R
SMALL R
100ns/DIV
20
T
T
/LARGE C
/SMALL C
D95IN344
30
R
C
V
I
T
Sense
A
FB
T
T
=25˚C
=10K
=3.3nF
=0V
V
C
T
T
T
D95IN342
A
i
=0V
L
100mA/DIV
=30V
= 15pF
= 25°C
20V/DIV
V
i
(V)
7/15

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