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UC2844A View Datasheet(PDF) - STMicroelectronics

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UC2844A Datasheet PDF : 16 Pages
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UC384XA - UC284XA
Table 2. 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 (DIP-8)
Ptot
Power Dissipation at Tamb 25 °C (SO-8)
Tstg
Storage Temperature Range
TJ
Junction Operating Temperature
TL
Lead Temperature (soldering 10s)
* 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)
Value
Unit
30
V
Self Limiting
±1
A
5
µJ
– 0.3 to 5.5
V
10
mA
1.25
W
800
mW
– 65 to 150
°C
– 40 to 150
°C
300
°C
COMP
VFB
ISENSE
RT/CT
1
8
2
7
3
6
4
5
D95IN332
VREF
Vi
OUTPUT
GROUND
Table 3. Pin Description
Pin
Function
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.
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