參數(shù)資料
型號(hào)： UC3845
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)： 13/16頁
文件大小： 354K
代理商： UC3845
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
13
+
+
Internal
Bias
Reference
Regulator
Oscillator
S
R
Q
V
ref
UVLO
3.6V
34V
7(12)
V
in
= 15V
7(11)
6(10)
5(8)
3(5)
+
0.5mA
Error
Amplifier
1(1)
2(3)
4(7)
8(14)
5(9)
10k
1.0nF
PWM
Latch
Current Sense
Comparator
R
R
2R
R
1.0V
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.
T
+
+
+
+
V
CC
UVLO
2.5V
UC3845
+
47
1N5819
+
15
10
1N5819
Connect to
Pin 2 for
closed loop
operation.
+
47
R2
R1
V
O
2 (V
in
)
V
O = 2.5
+ 1
R2
R2
Output Load Regulation
(open loop configuration)
I
O
(mA)
0
2
9
18
36
V
O
(V)
29.9
28.8
28.3
27.4
24.4
Figure 31. StepUp Charge Pump Converter
+
+
Internal
Bias
Reference
Regulator
Oscillator
S
R
Q
V
ref
UVLO
3.6V
34V
7(12)
V
in
= 15V
7(11)
6(10)
5(8)
3(5)
+
0.5mA
Error
Amplifier
1(1)
2(3)
4(7)
8(14)
5(9)
10k
1.0nF
PWM
Latch
Current Sense
Comparator
R
R
2R
R
1.0V
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.
T
+
+
+
+
V
CC
UVLO
2.5V
UC3845
+
47
+
15
10
1N5819
+
47
V
O
(V
in
)
Output Load Regulation
I
O
(mA)
0
2
9
18
32
V
O
(V)
14.4
13.2
12.5
11.7
10.6
1N5819
Figure 32. VoltageInverting Charge Pump Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC3845A 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller
UC3845A-BW 制造商:FCI 制造商全稱:First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current
UC3845AD 功能描述:電流型 PWM 控制器 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
UC3845AD1 功能描述:電流型 PWM 控制器 RO 511-UC3845BD 9/04 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
UC3845AD1013TR 制造商:STMicroelectronics 功能描述:
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