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UC3842BDG Datasheet(PDF) 7 Page - ON Semiconductor

Part No. UC3842BDG
Description  High Performance Current Mode Controllers
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842BDG Datasheet(HTML) 7 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
7
Sink Saturation
(Load to VCC)
TA = -55░C
VCC
Source Saturation
(Load to Ground)
0
800
0
IO, OUTPUT LOAD CURRENT (mA)
200
400
600
1.0
2.0
3.0
-2.0
-1.0
0
TA = -55░C
Figure 14. Output Saturation Voltage
versus Load Current
Figure 15. Output Waveform
Figure 16. Output Cross Conduction
Figure 17. Supply Current versus Supply Voltage
TA = 25░C
RT = 10 k
CT = 3.3 nF
VFB = 0 V
ISense = 0 V
TA = 25░C
0
0
VCC, SUPPLY VOLTAGE (V)
10
20
30
40
5
10
15
20
25
TA = 25░C
GND
VCC = 15 V
80
ms Pulsed Load
120 Hz Rate
VCC = 30 V
CL = 15 pF
TA = 25░C
VCC = 15 V
CL = 1.0 nF
TA = 25░C
50 ns/DIV
100 ns/DIV
90%
10%
PIN FUNCTION DESCRIPTION
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.
2,4,6,1
3
NC
No connection. These pins are not internally connected.


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