UC3845N Fairchild Semiconductor, UC3845N Datasheet - Page 5

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UC3845N

Manufacturer Part Number
UC3845N
Description
IC CTLR PWM CURR MODE 8-DIP
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of UC3845N

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
50%
Voltage - Supply
8.2 V ~ 30 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
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
Mounting Style
Through Hole
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 70 C
Fall Time
35 ns
Minimum Operating Temperature
0 C
Rise Time
45 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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During Under-Voltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with
a bleeder resistor to prevent activating the power switch with output leakage current.
Peak current (I
A small RC filter may be required to suppress switch transients.
I
S
MAX
=
1.0V
----------- -
R
S
S
) is determined by the formula:
Figure 3. Error Amp Configuration
Figure 2. Under Voltage Lockout
Figure 4. Current Sense Circuit
UC3842/44 UC3843/45
UC3842/UC3843/UC3844/UC3845
5

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