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PDF UC3844D1 Data sheet ( Hoja de datos )

Número de pieza UC3844D1
Descripción SMPS Controller
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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No Preview Available ! UC3844D1 Hoja de datos, Descripción, Manual

www.fairchildsemi.com
UC3842/UC3843/UC3844/UC3845
SMPS Controller
Features
• Low Start up Current
• Maximum Duty Clamp
• UVLO With Hysteresis
• Operating Frequency up to 500KHz
Internal Block Diagram
Description
The UC3842/UC3843/UC3844/UC3845 are fixed
frequencycurrent-mode PWM controller. They are specially
designed for Off-Line and DC to DC converter applications
with minimum external components. These integrated
circuits feature a trimmed oscillator for precise duty cycle
control, a temperature compensated reference, high gain
error amplifier, current sensing comparator and a high
current totempole output for driving a Power MOSFET. The
UC3842 and UC3844 have UVLO thresholds of 16V (on)
and 10V (off). The UC3843 and UC3845 are 8.5V(on) and
7.9V (off). The UC3842 and UC3843 can operate within
100% duty cycle. The UC3844 and UC3845 can operate
with 50% duty cycle.
8-DIP
8-SOP
1
14-SOP
1
1
* NORMALLY 8DIP/8SOP PIN NO.
* ( ) IS 14SOP PINNO.
* TOGGLE FLIP FLOP USED ONLY IN UC3844, UC3845
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1

1 page




UC3844D1 pdf
UC3842/UC3843/UC3844/UC3845
UC3842/44 UC3843/45
Figure 2. Under Voltage Lockout
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.
Figure 3. Error Amp Configuration
Figure 4. Current Sense Circuit
Peak current (IS) is determined by the formula:
IS(MAX)=
1----.--0---V---
RS
A small RC filter may be required to suppress switch transients.
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UC3844D1 arduino
Ordering Information
Product Number
UC3842N
UC3843N
UC3844N
UC3845N
UC3842D1
UC3843D1
UC3844D1
UC3845D1
UC3842D
UC3843D
UC3844D
UC3845D
Package
8-DIP
8-SOP
14-SOP
UC3842/UC3843/UC3844/UC3845
Operating Temperature
0 ~ + 70°C
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