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LM3845A Arkusz danych(PDF) 6 Page - HTC Korea TAEJIN Technology Co.

Numer części LM3845A
Szczegółowy opis  CURRENT MODE PWM CONTROLLER
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Producent  HTC [HTC Korea TAEJIN Technology Co.]
Strona internetowa  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

LM3845A Arkusz danych(HTML) 6 Page - HTC Korea TAEJIN Technology Co.

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CURRENT MODE PWM CONTROLLER
LM3842A/3A/4A/5A
A fraction of the oscillator ramp can be resistively summed with the current sense signal to
provide slope compensation for converters requiring duty cycles over 50%.
Note that capacitor, C, forms a filter with R2 to suppress the leading edge switch spikes.
Fig.1 Output Dead Time
Fig.2 Timing Resistor vs Frequency
Fig.3 Output Saturation Characteristics
Fig.4 Error Amplifier Open Loop
Gain and Phase Frequency
PIN FUNCTION DESCRIPTION
Pin No.
Function
Description
1
Compensation This pin is the Error Amplifier output and is made available for loop
compensation.
2
Voltage
This is the inverting input of the Error Amplitier.
It is normally connected
Feedback
to the switching power supply output through a resister divider.
3
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
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 500kHz is possible.
5
GND
This pin is the combined control circuitry and power ground.
6
Output
This output directly drives the gate of a power MOSFET. Peak currents
up to 1.0A are sourced and sunk by this pin.
7
Vcc
This pin is the positive supply of the control IC.
8
VREF
This is the reference output. It provides charging current for capacitor
CT through resistor RT.
HTC
6 −
10
-3
24
6 8 10-1
24
8
6
4
2
0
1
3
SINK (VOL)
VCC=15V
TA=25℃
SOURCE (V
CC-VOH)
Io, Output Load Current (A)
80
50
20
8.0
5.0
2.0
0.8
10k
20k
50k100k
500k
1.0M
200k
fosc, Frequency (kHz)
CT=10nF
CT=5.0nF
CT=2.0nF
CT=1.0nF
CT=500pF
CT=200pF
CT=100pF
100
10
30
3
1M
100k
10k
1k
100
fosc, Frequency(Hz)
CT=100nF
CT=47nF
CT=22nF
CT=10nF
CT=4.7nF
CT=2.2nF
CT=10nF
80
60
40
10K 100K
1M
1K
100
0
-135
10
-180
0
-45
20
Fosc, Frequency (Hz)
-90
10M
Gain
Phase


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