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UC2842A Datasheet(PDF) 2 Page - STMicroelectronics

Part No. UC2842A
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC2842A Datasheet(HTML) 2 Page - STMicroelectronics

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Table 2. Absolute Maximum Ratings
* All voltages are with respect to pin 5, all currents are positive into the specified terminal.
Figure 3. DIP-8/SO-8 Pin Connection (Top view)
Table 3. Pin Description
Symbol
Parameter
Value
Unit
Vi
Supply Voltage (low impedance source)
30
V
Vi
Supply Voltage (Ii < 30mA)
Self Limiting
IO
Output Current
±1A
EO
Output Energy (capacitive load)
5
µJ
Analog Inputs (pins 2, 3)
– 0.3 to 5.5
V
Error Amplifier Output Sink Current
10
mA
Ptot
Power Dissipation at Tamb ≤ 25 °C (DIP-8)
1.25
W
Ptot
Power Dissipation at Tamb ≤ 25 °C (SO-8)
800
mW
Tstg
Storage Temperature Range
– 65 to 150
°C
TJ
Junction Operating Temperature
– 40 to 150
°C
TL
Lead Temperature (soldering 10s)
300
°C
Pin
Function
1
COMP
This pin is the Error Amplifier output and is made available for loop compensation.
2VFB
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
supply output through a resistor divider.
3ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
4RT/CT
The oscillator frequency and maximum Output duty cycle are programmed by connecting
resistor RT to Vref and cpacitor CT to ground. Operation to 500kHz is possible.
5
GROUND
This pin is the combined control circuitry and power ground.
6
OUTPUT
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced
and sunk by this pin.
7VCC
This pin is the positive supply of the control IC.
8Vref
This is the reference output. It provides charging current for capacitor CT through resistor RT.
COMP
VFB
ISENSE
RT/CT
GROUND
OUTPUT
Vi
VREF
1
3
2
4
6
5
7
8
D95IN332


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