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參數(shù)資料
| 型號(hào)： | UC2845B |
| 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)： | 14/18頁 |
| 文件大小： | 400K |
| 代理商： | UC2845B |
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
14
Osc
+
Reference
Regulator
+
34V
S
R
Q
Internal
Bias
+
0.5mA
Osc
R
R
R
2R
Error
Amplifier
1.0V
7(12)
7(11)
6(10)
5(8)
3(5)
R1
V
in
= 15V
1(1)
2(3)
4(7)
8(14)
10k
1.0nF
The capacitor’s equivalent series resistance must limit the Drive Output current to 1.0 A. An additional series resistor
may be required when using tantalum or other low ESR capacitors. The converter’s output can provide excellent line
and load regulation by connecting the R2/R1 resistor divider as shown.
Figure 31. StepUp Charge Pump Converter
5(9)
PWM
Latch
T
Current Sense
Comparator
2.5V
3.6V
V
CC
UVLO
V
ref
UVLO
UC3845B
+
47
1N5819
15
10
1N5819
+
47
R2
Connect to
Pin 2 for
closed loop
operation.
R2
R1
1
V
O
≈
2 (V
in
)
Output Load Regulation
(Open Loop Configuration)
I
(mA)
V
O
(V)
0
2
9
18
36
29.9
28.8
28.3
27.4
24.4
+
+
S
R
+
R
R
R
2R
5(9)
PWM
Latch
T
Current Sense
Comparator
+
47
15
10
1N5819
+
47
Reference
Regulator
34V
Q
Internal
Bias
0.5mA
Error
Amplifier
1.0V
7(12)
7(11)
6(10)
5(8)
3(5)
V
in
= 15V
1(1)
2(3)
4(7)
8(14)
10k
1.0nF
The capacitor’s equivalent series resistance must limit the Drive Output current to 1.0 A.
An additional series resistor may be required when using tantalum or other low ESR capacitors.
Figure 32. VoltageInverting Charge Pump Converter
2.5V
3.6V
V
CC
UVLO
V
ref
UVLO
UC3845B
V
O
≈
V
in
Output Load Regulation
I
O
(mA)
V
O
(V)
0
2
9
18
32
14.4
13.2
12.5
11.7
10.6
1N5819
+
V
O
= 2.5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC2845BAC | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
| UC2845BD | 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(shí)間: 下降時(shí)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 |
| UC2845BD1 | 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(shí)間: 下降時(shí)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 |
| UC2845BD1013TR | 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(shí)間: 下降時(shí)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 |
| UC2845BD1G | 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(shí)間: 下降時(shí)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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