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參數(shù)資料
| 型號： | UC3845B |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Current Mode Controllers(高性能電流模式控制器) |
| 中文描述： | 高性能電流模式控制器（高性能電流模式控制器） |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 400K |
| 代理商： | UC3845B |
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V [Note 8], R
T
= 10 k, C
T
= 3.3 nF. For typical values T
A
= 25
°
C, for min/max values
T
A
is the operating ambient temperature range that applies [Note 9], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
PWM SECTION
Duty Cycle
Maximum (UC284XB, UC384XB)
Maximum
(UC384XBV)
Minimum
DC
(max)
DC
(min)
47
48
50
0
47
46
48
48
50
50
0
%
TOTAL DEVICE
Power Supply Current
Startup (V
CC
= 6.5 V for UCX845B,
Startup (V
CC
=
14 V for UCX844B, BV)
Operating (Note 8)
I
CC
0.3
12
0.5
17
0.3
12
0.5
17
mA
Power Supply Zener Voltage (I
CC
= 25 mA)
8. Adjust V
CC
above the Startup threshold before setting to 15 V.
9. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T
low
= 0
°
C for UC3844B, UC3845B
T
high
= + 70
°
C for UC3844B, UC3845B
= 25
°
C for UC2844B, UC2845B
= + 85
°
C for UC2844B, UC2845B
= 40
°
C for UC3844BV, UC3845BV
= +105
°
C for UC3844BV, UC3845BV
V
Z
30
36
30
36
V
0.8
2.0
5.0
8.0
20
50
80
R
Ω
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
f
OSC
, OSCILLATOR FREQUENCY (kHz)
Figure 2. Timing Resistor
versus Oscillator Frequency
Figure 3. Output Deadtime
versus Oscillator Frequency
1.0 M
100 k
10 k
f
OSC
, OSCILLATOR FREQUENCY (kHz)
50
%
7.C
= 100 pF
T
3.C
T
= 2.0 nF
5.C
T
= 500 pF
T
55
60
65
70
75
20 k
50 k
200 k
500 k
2
3
7
5
6
NOTE: Output switches at
1/2 the oscillator frequency
V
CC
= 15 V
T
A
= 25
°
C
0.5 s/DIV
2
2.55 V
2.5 V
2.45 V
V
CC
= 15 V
A
V
= 1.0
T
A
= 25
°
C
V
CC
= 15 V
A
V
= 1.0
T
A
= 25
°
C
1.0 s/DIV
2
2.5 V
3.0 V
2.0 V
Figure 4. Error Amp Small Signal
Transient Response
Figure 5. Error Amp Large Signal
Transient Response
1
4
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845BAC | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC3845BD | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845BD1 | 功能描述:電流型 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845BD1013TR | 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845BD1G | 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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