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| 型号： | TPS40074RHL |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | PLASTIC, QFN-20 |
| 文件页数： | 2/37页 |
| 文件大小： | 448K |
| 代理商： | TPS40074RHL |
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VDD Input Voltage V
f OSC
Frequency
kHz
2
6
18
26
30
10
500
495
505
520
510
515
490
485
480
14
22
TYPICAL SWITCHING FREQUENCY
vs
INPUT VOLTAGE
fSW Switching Frequency kHz
SWITCHING FREQUENCY
vs
TIMING RESISTANCE
0
100
0
200
400
600
800
1000
200
300
400
500
600
R
T
iming
Resistance
k
PROGRAMMING THE RAMP GENERATOR CIRCUIT AND UVLO FUNCTION
VUVLO(on) + 0.018 RKFF ) 5
RKFF
RT
) 0.5
(4)
TPS40074
SLUS617–APRIL 2005
APPLICATION INFORMATION (continued)
Figure 3.
Figure 4.
The ramp generator circuit provides the actual ramp used by the PWM comparator and provides voltage
feed-forward by varying the PWM ramp slope as the line voltage changes. As the input voltage to the converter
increases, the slope of the PWM ramp increase by a proportionate amount. The programmable UVLO circuit
works by monitoring the level reached by the PWM ramp during a clock cycle. The PWM ramp must reach
approximately 1 V in amplitude during a clock cycle, or the converter is not be allowed to start. This
programmable UVLO point is set via a single resistor (RKFF) connected from KFF to VDD. RKFF ,VSTART and RRT
are related by (approximately)
where
VUVLO(on) is in volts
RKFF and RT areink
This yields typical numbers for the programmed startup voltage. The minimum and maximum values may vary up
±15% from this number. Figure 5 through Figure 7 show the typical relationship of VUVLO(on),VUVLO(off) and RKFF at
three common frequencies.
10
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相关代理商/技术参数 |
参数描述 |
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| TPS40074RHLR | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLRG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLT | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40074RHLTG4 | 功能描述:DC/DC 开关控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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 |
| TPS40075 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD |
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