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| 型号： | TL5001QD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 26/31页 |
| 文件大小： | 745K |
| 代理商： | TL5001QD |
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TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS084F – APRIL 1994 – REVISED JANUARY 2002
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
dead-time control (DTC) (continued)
R
DT +
Rt ) 1250 D Voscmax – Voscmin ) Voscmin
Where
RDT and Rt are in ohms, D in decimal
Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Figure 2. During
soft start, the voltage at DTC is derived by the following equation:
V
DT [
I
DT
R
DT
1– e
– t R
DT
C
DT
TL5001/A
DTC
CDT
RDT
6
Figure 2. Soft-Start Circuit
If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, RDTCDT, should
be t0/3 to t0/5. The TL5001/A remains off until VDT ≈ 0.7 V, the minimum ramp value. CDT is discharged every time
UVLO or SCP becomes active.
undervoltage-lockout (UVLO) protection
The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply voltage
drops too low (approximately 3 V at 25
°C) for proper operation. A hysteresis voltage of 200 mV eliminates false
triggering on noise and chattering.
short-circuit protection (SCP)
The TL5001/A includes short-circuit protection (see Figure 3), which turns the power switch off to prevent damage
when the converter output is shorted. When activated, the SCP prevents the switch from being turned on until the
internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes active or until
the SCP terminal is pulled to ground externally.
When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle in an
attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds 1.5 V.
If the short is removed and the error-amplifier output drops below 1.5 V before time out, normal converter operation
continues. If the fault is still present at the end of the time-out period, the timer sets the latching circuit and turns
off the TL5001/A output transistor.
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相关代理商/技术参数 |
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| TL5001QDG4 | 功能描述:软开关 PWM 控制器 PWM Controller w/ Wide Input Range RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| TL5001QDR | 功能描述:软开关 PWM 控制器 withWide Input Voltage Range RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| TL5001QDRG4 | 功能描述:软开关 PWM 控制器 PWM Controller w/ Wide Input Range RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| TL5001-S08-R | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:PULSE-WIDTH-MODULATION CONTROL CIRCUITS |
| TL5001-S08-T | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:PULSE-WIDTH-MODULATION CONTROL CIRCUITS |
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