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PDF UC3842A-BW Data sheet ( Hoja de datos )

Número de pieza UC3842A-BW
Descripción Current Mode PWM Controller
Fabricantes FCI 
Logotipo FCI Logotipo



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No Preview Available ! UC3842A-BW Hoja de datos, Descripción, Manual

UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
DESCRIPTION
The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM
controller. They are specially designed for OFFLine and DC to DC converter applications
with a minimal external components. Internally implemented circuits include a trimmed
PIN
CONNECTION
(TOP VIEW)
oscillator for precise duty cycle control, a temperature compensated reference, high gain
error amplifier, current sensing comparator, and a high current totempole output ideally
suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout
and current limiting.
The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The
corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and
7.6V (off).
The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW
and UC3845A-BW can operate within 50% duty cycle.
The UC384XA-BW has Start-Up Current 0.17mA (typ).
The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier.
FEATURES
Low Start-Up and Operating Current
High Current Totem Pole Output
Undervoltage Lockout With Hysteresis
Operating Frequency Up To 500KHz
BLOCK DIAGRAM
(toggle flip flop used only in UC3844, UC3845)
Absolute Maximum Ratings
Characteristic
Supply Voltage (low impedance
source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Symbol
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Value
30
±1
0.3 to 5.5
10
1
-65 to150
260
Unit
V
A
V
mA
W
oC
oC
1

1 page




UC3842A-BW pdf
UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
SCR must be selected for a holding current of less than 0.5mA.
The simple two transistor circuit can be used in place of the SCR as shown.
Figure 5. Latched Shutdown
Figure 6. Error Amplifier Compensation
5

5 Page










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