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| 型号： | UC3845BD1R2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 8-SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 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： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
UC3844B, UC3845B, UC2844B, UC2845B
0
-1.0
- 2.0
V CC
T A = 25 ° C
Source Saturation
(Load to Ground)
T A = - 55 ° C
V CC = 15 V
80 m s Pulsed Load
120 Hz Rate
90
%
V CC = 15 V
C L = 1.0 nF
T A = 25 ° C
3.0
2.0
T A = - 55 ° C
T A = 25 ° C
1.0
Sink Saturation
(Load to V CC )
GND
10
%
0
0
200 400 600
800
50 ns/DIV
I O , OUTPUT LOAD CURRENT (mA)
Figure 12. Output Saturation Voltage
versus Load Current
V CC = 30 V
25
Figure 13. Output Waveform
C L = 15 pF
T A = 25 ° C
20
15
10
5
R T = 10 k
C T = 3.3 nF
V FB = 0 V
0
0
10
I Sense = 0 V
T A = 25 ° C
20 30
40
100 ns/DIV
Figure 14. Output Cross Conduction
PIN FUNCTION D ESCRIPTION
Pin
V CC , SUPPLY VOLTAGE (V)
Figure 15. Supply Current versus Supply Voltage
8 ? Pin
1
2
3
4
5
6
7
8
14 ? Pin
1
3
5
7
10
12
14
8
11
9
2,4,6,13
Function
Compensation
Voltage
Feedback
Current Sense
R T /C T
GND
Output
V CC
V ref
Power
Ground
V C
GND
NC
Description
This pin is the Error Amplifier output and is made available for loop compensation.
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor
R T to V ref and capacitor C T to ground. Oscillator operation to 1.0 kHz is possible.
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced
and sunk by this pin. The output switches at one ? half the oscillator frequency.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor C T through resistor R T .
This pin is a separate power ground return that is connected back to the power source. It is used
to reduce the effects of switching transient noise on the control circuitry.
The Output high state (V OH ) is set by the voltage applied to this pin. With a separate power source
connection, it can reduce the effects of switching transient noise on the control circuitry.
This pin is the control circuitry ground return and is connected back to the powersource ground.
No connection. These pins are not internally connected.
http://onsemi.com
6
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相关代理商/技术参数 |
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| UC3845BD1R2G | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max 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 |
| UC3845BDG | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max 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 |
| UC3845BDG | 制造商:ON Semiconductor 功能描述:IC CURRENT MODE PWM CTRL 25V SOIC-14 制造商:ON Semiconductor 功能描述:IC, CURRENT MODE PWM CTRL, 25V, SOIC-14 |
| UC3845BDR2 | 功能描述:电流型 PWM 控制器 52kHz 1A Current 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 |
| UC3845BDR2G | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max 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 |
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