參數(shù)資料
型號(hào)： 2845B
廠商： Texas Instruments, Inc.
英文描述： HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
中文描述： 高性能的電流模式PWM控制器
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 336K
代理商： 2845B
www.ti.com
TIMING RESISTANCE
vs
FREQUENCY
R
T
100
1k
10k
100k
1M
f Frequency Hz
100
40
10
4
1
V
CC
= 15 V
T
A
= 25
°
C
C
T
= 22 nF
C
T
= 47 nF
C
T
= 100 nF
C
T
= 10 nF
C
T
= 4.7 nF
C
T
= 22 nF
C
T
= 1 nF
DEAD TIME
vs
TIMING CAPACITANCE
s
μ
D
100
40
10
4
0
C
T
Timing Capacitance nF
100
40
10
4
1
0.4
0.1
V
CC
= 15 V
R
T
≥
5 k
T
A
= 25
°
C
Open-Loop Laboratory Test Fixture
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
potentiometer sample the oscillator waveform and apply an
adjustable ramp to the I
SENSE
terminal.
2N2222
4.7 k
1-k
Error Amplifier Adjust
4.7 k
5 k
I
SENSE
Adjust
R
T
100 k
V
CC
0.1
μ
F
0.1
μ
F
REF
V
CC
OUTPUT
GND
1 k
, 1 W
A
C
T
TL284xB
TL384xB
I
SENSE
V
REF
R
T
/C
T
VFB
COMP
OUTPUT
GND
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A–AUGUST 2006–REVISED SEPTEMBER 2006
APPLICATION INFORMATION (continued)
Figure 4. Open-Loop Laboratory Test Fixture
12
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