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UC2842BD1 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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UC2842BD1 Datasheet PDF : 21 Pages
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UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
0
ÄÄÄÄÄÄÄÄÄ VCC
Source Saturation
VCC = 15 V
(Load to Ground) 80 ms Pulsed Load
ÄÄÄÄÄÄÄÄÄÄÄÄÄ −1.0
TA = 25°C
120 Hz Rate
ÄÄÄÄ ÄÄÄÄÄ −2.0
ÄÄÄÄ TA = − 55°C
ÄÄÄÄ 3.0
ÄÄÄ TA = − 55°C
ÄÄÄ ÄÄÄ 2.0
TA = 25°C
ÄÄÄÄ ÄÄÄ 1.0
Sink Saturation
ÄÄÄÄ ÄÄ (Load to VCC)
GND
90%
10%
0
0
200
400
600
800
IO, OUTPUT LOAD CURRENT (mA)
50 ns/DIV
VCC = 15 V
CL = 1.0 nF
TA = 25°C
Figure 14. Output Saturation Voltage
versus Load Current
Figure 15. Output Waveform
25
VCC = 30 V
CL = 15 pF
TA = 25°C
100 ns/DIV
Figure 16. Output Cross Conduction
20
15
10
5
ÄÄÄÄ RT = 10 k
ÄÄÄÄ CT = 3.3 nF
VFB = 0 V
ÄÄÄÄ ISense = 0 V
ÄÄÄÄ TA = 25°C
0
0
10
20
30
40
VCC, SUPPLY VOLTAGE (V)
Figure 17. Supply Current versus Supply Voltage
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
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
Feedback
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
5
RT/CT
GND
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.
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
8
14
8
VCC
Vref
Power
Ground
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor CT through resistor RT.
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
NC
3
No connection. These pins are not internally connected.
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8
 

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