UC3845BN STMicroelectronics, UC3845BN Datasheet - Page 11
UC3845BN
Manufacturer Part Number
UC3845BN
Description
IC CTLR PWM HP CURR MODE 8-DIP
Manufacturer
STMicroelectronics
Datasheet
1.UC3845BD1013TR.pdf
(15 pages)
Specifications of UC3845BN
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
50%
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-DIP (0.300", 7.62mm)
Frequency-max
500kHz
Duty Cycle (max)
50 %
Output Voltage
4.90 V to 5.10 V
Output Current
1000 mA (Max)
Mounting Style
Through Hole
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
150 C
Fall Time
50 ns
Minimum Operating Temperature
- 40 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost or Flyback
Input Voltage
15V
Frequency
250kHz
Power Dissipation Pd
1.25W
Supply Voltage Range
12V To 25V
Digital Ic Case Style
DIP
No. Of Pins
8
Rohs Compliant
Yes
For Use With
497-5863 - EVAL BOARD 2W 3PH SMPS BRKR ESBT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
STUC3845BN
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Company
Part Number
Manufacturer
Quantity
Price
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Figure 22: External Clock Synchronization.
Figure 23: External Duty Cycle Clamp and Multi Unit Synchronization.
f =
R
R
C
(R
A
B
A
V
1.44
+ 2R
REF
SYNC INPUT
EXTERNAL
The diode clamp is required if the Sync amplitude is large enough to cause
the bottom side of C
B
)C
6
5
2
5K
5K
5K
D
max
8
1
=
0.01 F
+
+
-
-
R
A
R
+ 2R
B
T
to go more than 300mV below ground
NE555
B
R
S
Q
4
47
R
C
T
T
V
REF
8
4
2
1
3
7
+
-
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
EA
+
R
R
8
4
2
1
+
-
BIAS
OSC
EA
TO ADDITIONAL
2R
UCX84XAs
R
+
R
R
5
BIAS
OSC
D95IN352
D95IN353
2R
R
5
11/15