参数资料
型号: UC3845N
厂商: ON Semiconductor
文件页数: 13/16页
文件大小: 0K
描述: IC REG CTRLR PWM CM 8-DIP
产品变化通告: Product Discontinuation 15/May/2006
标准包装: 1,000
PWM 型: 电流模式
输出数: 1
频率 - 最大: 60kHz
占空比: 50%
电源电压: 7.6 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
其它名称: UC3845NOS
UC3844, UC3845, UC2844, UC2845
V in = 15V
UC3845
7(12)
+
47
Output Load Regulation
(open loop configuration)
8(14)
2.5V
R
Internal
Bias
Reference
Regulator
+
V CC
UVLO
+
?
+
?
34V
7(11)
1N5819
I O (mA)
0
2
9
18
36
V O (V)
29.9
28.8
28.3
27.4
24.4
1N5819
V O = 2.5
R2
10k
4(7)
1.0nF
2(3)
1(1)
R
+
?
Error
Amplifier
Oscillator
+
0.5mA
2R
R
+ ?
3.6V V ref
? UVLO
?
+
1.0V
Current Sense
Comparator
T
S
R
Q
PWM
Latch
6(10)
5(8)
3(5)
15 10
+
Connect to
Pin 2 for
closed loop
operation.
R2
+1
R2
R1
+
47
V O   2 (V in )
5(9)
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. Step ? Up Charge Pump Converter
V in = 15V
UC3845
7(12)
+
47
8(14)
Reference
+
34V
2.5V
R
Internal
Bias
Regulator
+
V CC
UVLO
?
+
?
7(11)
V O   ? (V in )
10k
4(7)
1.0nF
2(3)
1(1)
R
+
?
Error
Amplifier
Oscillator
+
0.5mA
2R
R
3.6V
1.0V
+ ?
?
?
+
V ref
UVLO
T
S
R
Q
PWM
Latch
6(10)
+
5(8)
3(5)
15
10
1N5819
+
1N5819 47
Output Load Regulation
I O (mA) V O (V)
Current Sense
Comparator
5(9)
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. Voltage ? Inverting Charge Pump Converter
http://onsemi.com
13
0
2
9
18
32
?14.4
?13.2
?12.5
?11.7
?10.6
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