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UC2844DG Fiches technique(PDF) 6 Page - ON Semiconductor

No de pièce UC2844DG
Description  High Performance Current Mode Controllers
Download  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC2844DG Fiches technique(HTML) 6 Page - ON Semiconductor

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UC3844, UC3845, UC2844, UC2845
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6
Figure 14. Output Cross Conduction
Figure 15. Supply Current versus
Supply Voltage
100 ns/DIV
VCC = 30 V
CL = 15 pF
TA = 255C
25
20
15
10
5
0
0
10203040
VCC, SUPPLY VOLTAGE (V)
RT = 10 k
CT = 3.3 nF
VFB = 0 V
ISense = 0 V
TA = 255C
PIN FUNCTION DESCRIPTION
Pin
Function
Description
8−Pin
14−Pin
1
1
Compensation
This pin is 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 1.0 MHz is possible.
5
GND
This pin is combined control circuitry and power ground (8−pin package only).
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. The output switches at one−half the oscillator frequency.
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 (14−pin package only) 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 (14−pin package only).
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 (14−pin package only) and is connected to back
to the power source ground.
2,4,6,13
NC
No connection (14−pin package only). These pins are not internally connected.


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