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TL3842BD Datasheet(PDF) 12 Page - Texas Instruments

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Part No. TL3842BD
Description  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

TL3842BD Datasheet(HTML) 12 Page - Texas Instruments

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TIMING RESISTANCE
vs
FREQUENCY
100
1k
10k
100k
1M
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 = 2.2 nF
CT = 1 nF
DEAD TIME
vs
TIMING CAPACITANCE
100
40
10
4
1
CT − Timing Capacitance − nF
100
40
10
4
1
0.4
0.1
VCC = 15 V
RT ≥ 5 kΩ
TA = 25°C
Open-Loop Laboratory Test Fixture
2N2222
4.7 k
1-k
Error Amplifier Adjust
4.7 k
5 k
ISENSE
Adjust
RT
100 k
VCC
0.1
µF
0.1
µF
REF
VCC
OUTPUT
GND
1 k
Ω, 1 W
A
CT
TL284xB
TL384xB
ISENSE
VREF
RT/CT
VFB
COMP
OUTPUT
GND
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
APPLICATION INFORMATION (continued)
In the open-loop laboratory test fixture (see Figure 4), 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.
Figure 4. Open-Loop Laboratory Test Fixture
12
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