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UC3842B Datasheet(PDF) 7 Page - Motorola, Inc

Part # UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3842B Datasheet(HTML) 7 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
7
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION
Pin
Fi
Di
i
8–Pin
14–Pin
Function
Description
1
1
Compensation
This pin is the Error Amplifier output and is made available for loop compensation.
2
3
Voltage
Feedback
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
supply output through a resistor divider.
3
5
Current
Sense
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
4
7
RT/CT
The Oscillator frequency and maximum Output duty cycle are programmed by
connecting resistor RT to Vref and capacitor CT to ground. Operation to 500 kHz
is possible.
5
Gnd
This pin is the combined control circuitry and power ground.
6
10
Output
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced
and sunk by this pin.
7
12
VCC
This pin is the positive supply of the control IC.
8
14
Vref
This is the reference output. It provides charging current for capacitor CT through resistor RT.
8
Power
Ground
This pin is a separate power ground return that is connected back to the power source. It is used
to reduce the effects of switching transient noise on the
control circuitry.
11
VC
The Output high state (VOH) is set by the voltage applied to this pin. With a separate power
source connection, it can reduce the effects of switching transient noise on the control circuitry.
9
Gnd
This pin is the control circuitry ground return and is connected back to the power source ground.
2,4,6,13
NC
No connection. These pins are not internally connected.


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