参数资料
型号: UC2845BDR2G
厂商: ON Semiconductor
文件页数: 14/19页
文件大小: 0K
描述: IC REG CTRLR PWM CM 14-SOIC
标准包装: 2,500
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: -25°C ~ 85°C
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
其它名称: UC2845BDR2G-ND
UC2845BDR2GOSTR
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
相关PDF资料
PDF描述
S1008-152K INDUCTOR SHIELDED 1.5UH SMD
UC2844BDR2G IC REG CTRLR PWM CM 14-SOIC
GBA50DTBD-S664 CONN EDGECARD 100PS R/A .125 SLD
MCP1826T-0802E/DC IC REG LDO 0.8V 1A SOT223-5
RGM18DTBD-S189 CONN EDGECARD 36POS R/A .156 SLD
相关代理商/技术参数
参数描述
UC2845BG 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2845BL 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2845BN 功能描述:电流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
UC2845BNG 功能描述:电流型 PWM 控制器 ANA SMPS PWM CONTROLLER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
UC2845D 功能描述:电流型 PWM 控制器 Current Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14