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TL2844 データシート(PDF) 9 Page - Texas Instruments

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部品番号 TL2844
部品情報  CURRENT-MODE PWM CONTROLLERS
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TL2844 データシート(HTML) 9 Page - Texas Instruments

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TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038F – JANUARY 1989 – REVISED FEBRUARY 2003
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
DEAD TIME
vs
TIMING CAPACITANCE
Figure 4
100
40
10
4
0
CT – Timing Capacitance – nF
100
40
10
4
1
0.4
0.1
VCC = 15 V
RT ≥ 5 kΩ
TA = 25°C
TIMING RESISTANCE
vs
FREQUENCY
Figure 5
100
1 k
10 k
100 k
1 M
f – Frequency – Hz
100
40
10
4
1
VCC = 15 V
TA = 25°C
CT = 22 nF
CT = 47 nF
CT = 100 nF
CT = 10 nF
CT = 4.7 nF
CT = 22 nF
CT = 1 nF
open-loop laboratory test fixture
In the open-loop laboratory test fixture (see Figure 6), high peak currents associated with loads necessitate
careful grounding techniques. Timing and bypass capacitors should be connected close to the GND terminal
in a single-point ground. The transistor and 5-k
Ω potentiometer sample the oscillator waveform and apply an
adjustable ramp to the ISENSE terminal.
2N2222
4.7 k
1 k
Error Amplifier
Adjust
4.7 k
5 k
ISENSE
Adjust
RT
100 k
COMP
VFB
ISENSE
RT/CT
REF
OUTPUT
GND
VCC
0.1
µF
0.1
µF
REF
VCC
OUTPUT
GND
1 k
Ω, 1 W
A
CT
TL284x
TL384x
DUT
Figure 6. Open-Loop Laboratory Test Fixture


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