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参数资料
| 型号： | TL1454ACDG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, SOIC-16 |
| 文件页数： | 21/25页 |
| 文件大小： | 503K |
| 代理商： | TL1454ACDG4 |
TL1454A, TL1454AY
DUALCHANNEL PULSEWIDTHMODULATION (PWM)
CONTROL CIRCUIT
SLVS423 A MAY 2002 REVISED SEPTEMBER 2002
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
error amplifier
R1 and R2 should be tight-tolerance (
±1% or better) devices with low and/or matched temperature coefficients
to minimize output voltage errors. A device with a
±5% tolerance is suitable for R3.
_
+
IN
IN +
R2
COMP
To PWM
VO
Compensation
Network
REF
R1
R3
Converter
Output
Figure 2. Sense Divider/Error Amplifier Configuration for Converters with Negative Outputs
Figure 2 shows the divider network and error-amplifier configuration for negative output voltages. In general,
the comments for positive output voltages also apply for negative outputs. The output voltage is given by:
V
O +*
R
1
V
ref
R
2
The design procedure for choosing the resistor value is to select a convenient value for R2 (instead of R3 in
the procedure for positive outputs) and calculate R1 and R3 using:
R
1 +*
R
2
V
O
V
ref
R
3 +
R
1
R
2
R
1 )
R
2
Values in the 10-k
to 20-k range work well for R2. R3 can be omitted and the noninverting amplifier connected
to ground in applications where the output voltage tolerance is not critical.
oscillator
The oscillator frequency can be set between 50 kHz and 2 MHz with a resistor connected between RT and GND
and a capacitor between CT and GND (see Figure 3). Figure 6 is used to determine RT and CT for the desired
operating frequency. Both components should be tight-tolerance, temperature-stable devices to minimize
frequency deviation. A 1% metal-film resistor is recommended for RT, and a 10%, or better, NPO ceramic
capacitor is recommended for CT.
RT
CT
RT
CT
TL1454A
21
Figure 3. Oscillator Timing
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TL1454ACDR | 功能描述:DC/DC 开关控制器 Dual-Ch PWM Control Circuit RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TL1454ACDRG4 | 功能描述:DC/DC 开关控制器 Dual-Ch PWM Control Circuit RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TL1454ACN | 功能描述:DC/DC 开关控制器 Dual ch PWM Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TL1454ACNE4 | 功能描述:DC/DC 开关控制器 Dual ch PWM Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TL1454ACNS | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT |
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