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UC2845BD1 Fiches technique(PDF) 7 Page - ON Semiconductor

No de pièce UC2845BD1
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Download  20 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC2845BD1 Fiches technique(HTML) 7 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
7
Sink Saturation
(Load to VCC)
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
Figure 12. Output Saturation Voltage
versus Load Current
Figure 13. Output Waveform
TA = 25°C
TA = −55°C
VCC
VCC = 15 V
80
ms Pulsed Load
120 Hz Rate
TA = −55°C
TA = 25°C
0
800
0
I O, OUTPUT LOAD CURRENT (mA)
200
400
600
1.0
2.0
3.0
−2.0
−1.0
0
Source Saturation
(Load to Ground)
GND
50 ns/DIV
90
%
10
%
VCC = 15 V
CL = 1.0 nF
TA = 25°C
100 ns/DIV
VCC = 30 V
CL = 15 pF
TA = 25°C
Figure 14. Output Cross Conduction
Figure 15. Supply Current versus Supply Voltage
PIN FUNCTION DESCRIPTION
Pin
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. Oscillator operation to 1.0 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. 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 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 powersource ground.
2,4,6,13
NC
No connection. These pins are not internally connected.


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