参数资料
型号: UC3845BD1R2G
厂商: ON Semiconductor
文件页数: 14/19页
文件大小: 0K
描述: IC REG CTRLR PWM CM 8-SOIC
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 275kHz
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-SOIC(0.154",3.90mm 宽)
包装: 标准包装
其它名称: UC3845BD1R2GOSDKR
UC3844B, UC3845B, UC2844B, UC2845B
V in = 15V
Output Load Regulation
(Open Loop Configuration)
UC3845B
Reference
7(12)
34V
+
47
I O (mA)
0
2
V O (V)
29.9
28.8
8(14)
10k
2.5V
R
R
Internal
Bias
3.6V
+
-
Regulator
V ref
UVLO
V CC
UVLO
+
-
7(11)
6(10)
15
1N5819
10
1N5819
9
18
36
28.3
27.4
24.4
1.0nF
4(7)
2(3)
Error
Amplifier
+
Osc
0.5mA
2R
R
1.0V
S
R
T
Q
PWM
Latch
5(8)
3(5)
+
Connect to
Pin 2 for
closed loop
operation.
R2
+
47
V O ≈ 2 (V in )
R2 ) 1
1(1)
5(9)
Current Sense
Comparator
V O = 2.5
R1
R1
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
Output Load Regulation
+ V ref
-
1.0nF
10k
8(14)
4(7)
2(3)
2.5V
R
R
+
Internal
Bias
Osc
0.5mA
2R
UC3845B
Reference
Regulator
3.6V
UVLO
S
V CC
UVLO
T
Q
+
-
7(12)
34V
7(11)
6(10)
5(8)
+
15
47
10
I O (mA)
0
2
9
18
32
1N5819
+
1N5819
47
V O (V)
? 14.4
? 13.2
? 12.5
? 11.7
? 10.6
V O ≈ -V in
Error
Amplifier
R
1.0V
R
PWM
Latch
3(5)
1(1)
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
14
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