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UC3842A Datasheet(PDF) 2 Page - STMicroelectronics

Part No. UC3842A
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842A Datasheet(HTML) 2 Page - STMicroelectronics

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* All voltages are with respect to pin 5, all currents arepositive into the specified terminal.
PIN CONNECTION (top view)
COMP
VFB
ISENSE
RT/CT
GROUND
OUTPUT
Vi
VREF
1
3
2
4
6
5
7
8
D95IN332
Minidip/SO8
ORDERING NUMBERS
SO8
Minidip
UC2842AD1; UC3842AD1
UC2843AD1; UC3843AD1
UC2844AD1; UC3844AD1
UC2845AD1; UC3845AD1
UC2842AN; UC3842AN
UC2843AN; UC3843AN
UC2844AN; UC3844AN
UC2845AN; UC3845AN
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Valu e
Un it
Vi
Supply Voltage (low impedance source)
30
V
Vi
Supply Voltage (Ii < 30mA)
Self Limiting
IO
Output Current
±1
A
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 (Minidip)
1.25
W
Ptot
Power Dissipation at Tamb
≤ 25 °C (SO8)
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 FUNCTIONS
No
Function
Description
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.
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
2/15


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