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參數(shù)資料
| 型號： | UC3844TD |
| 廠商： | 意法半導體 |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER |
| 中文描述： | 高性能電流模式PWM控制器 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大小： | 228K |
| 代理商： | UC3844TD |
Figure 1:
Open Loop Test Circuit.
R
T
A
2N2222
4.7K
1K
ERROR AMP.
ADJUST
4.7K
5K
I
ADJUST
100K
COMP
V
FB
I
SENSE
R
T
/C
T
1
2
3
4
C
T
7
6
5
8
V
REF
V
i
OUTPUT
GROUND
0.1
μ
F
0.1
μ
F
V
REF
V
i
OUTPUT
GROUND
1W
1K
D95IN343
D.U.T.
High peak currents associated with capacitive loads
necessitate careful grounding techniques. Timing
and bypass capacitors should be connected close
to pin 5 in a single point ground. The transistor and
5 K
potentiometer are used to sample the oscillator
waveform and apply an adjustable ramp to pin 3.
10K
20K
30K
50K
100K
200K
300K
500K
f
OSC
(KHz)
1
2
5
10
20
50
D95IN333
C
T
=10nF
C
T
=5nF
C
T
=2nF
C
T
=1nF
C
T
=500pF
C
T
=200pF
C
T
=100pF
V
i
=15V
T
A
=25C
RT
(K
)
0.8
Figure 2:
Timing Resistor vs. Oscillator Fre-
quency
10K
20K
30K
50K
100K
200K
300K
500K fOSC(KHz)
1
2
3
5
10
20
30
50
%
C
T
=10nF
C
T
=5nF
C
T
=2nF
C
T
=1nF
C
T
=500pF
C
T
=200pF
C
T
=100pF
D95IN334
V
i
=15V
T
A
=25C
Figure 3:
Output Dead-Time vs. Oscillator Fre-
quency
U3842T - UC3843T - UC3844T - UC3845T
5/15
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3844TN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| UC3844W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMPS Controller |
| UC3844Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT MODE PWM CONTROLLER |
| UC3845 | 制造商:STMicroelectronics 功能描述:3845 |
| UC3845A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
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