UC3842T Просмотр технического описания (PDF) - STMicroelectronics
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UC3842T Datasheet PDF : 15 Pages
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UC3842T - UC3843T - UC3844T - UC3845T
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Vi
Supply Voltage (low impedance source)
Vi
Supply Voltage (Ii < 30mA)
IO
Output Current
EO
Output Energy (capacitive load)
Analog Inputs (pins 2, 3)
Error Amplifier Output Sink Current
Ptot
Power Dissipation at Tamb ≤ 25 °C (Minidip)
Ptot
Power Dissipation at Tamb ≤ 25 °C (SO8)
Tstg
Storage Temperature Range
TL
Lead Temperature (soldering 10s)
* All voltages are with respect to pin 5, all currents are positive into the specified terminal.
PIN CONNECTION (top view)
Minidip/SO8
Value
30
Self Limiting
±1
5
– 0.3 to 5.5
10
1.25
800
– 65 to 150
300
Unit
V
A
µJ
V
mA
W
mW
°C
°C
COMP
VFB
ISENSE
RT/CT
1
8
2
7
3
6
4
5
D95IN332
VREF
Vi
OUTPUT
GROUND
PIN FUNCTIONS
No Function
Description
1
COMP This pin is the Error Amplifier output and is made available for loop compensation.
2
VFB
This is the inverting input of the Error Amplifier. It is normally connected to the switching
power supply output through a resistor divider.
3
ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
4
RT/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.
7
VCC
This pin is the positive supply of the control IC.
8
Vref
This is the reference output. It provides charging current for capacitor CT through resistor RT.
ORDERING NUMBERS
SO8
UC3842TD
UC3843TD
UC3844TD
UC3845TD
Minidip
UC3842TN
UC3843TN
UC3844TN
UC3845TN
2/15
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