UC3843D1 Fairchild Semiconductor, UC3843D1 Datasheet - Page 5
UC3843D1
Manufacturer Part Number
UC3843D1
Description
Current Mode PWM Controllers Current Mode PWM Control IC
Manufacturer
Fairchild Semiconductor
Datasheet
1.UC3843D1.pdf
(12 pages)
Specifications of UC3843D1
Number Of Outputs
1
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
SMD/SMT
Package / Case
SOP-8
Switching Frequency
500 KHz
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
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