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参数资料
| 型号： | TPS61500PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 2640 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | GREEN, PLASTIC, HTSSOP-14 |
| 文件页数： | 2/21页 |
| 文件大小： | 725K |
| 代理商： | TPS61500PWP |
SOFT START
ENABLE AND THERMAL SHUTDOWN
UNDER VOLTAGE LOCKOUT (UVLO)
OVER VOLTAGE PROTECTION
SLVS893 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
Increasing switching frequency reduces the value of external capacitors and inductors, but also reduces the
power conversion efficiency. The user should set the frequency for compromise between efficiency and solution
size.
The TPS61500 has a built-in soft start circuit which significantly reduces the start-up current spike and output
voltage overshoot. When the IC is enabled, an internal bias current (6-
A typically) charges a capacitor (C3) on
the SS pin. The voltage at the capacitor clamps the output of the internal error amplifier that determines the duty
cycle of PWM control, thereby the input inrush current is eliminated. Once the capacitor reaches 1.8-V, the soft
start cycle is completed and the soft start voltage no longer clamps the error amplifier output. Refer to Figure 12
and Figure 13 for the soft start waveform. A 47-nF capacitor eliminates the output overshoot and reduces the
peak inductor current for most applications.
When the EN is pulled low for 10-ms, the IC enters shutdown and the SS capacitor discharges through a 5k
resistor for the next soft start.
The TPS61500 enters shutdown when the EN voltage is less than 0.4-V for more than 10-ms. In shutdown, the
input supply current for the device is less than 1.5
A (max). The EN pin has an internal 800-k pull down
resistor to disable the device when it is floating.
An internal thermal shutdown turns off the device when the typical junction temperature of 160°C is exceeded.
The IC restarts when the junction temperature drops by 15°C.
An under voltage lockout prevents mis-operation of the device at input voltages below typical 2.5V. When the
input voltage is below the under voltage threshold, the device remains off and the internal switch FET is turned
off. The under voltage lockout threshold is set below minimum operating voltage of 2.9V to avoid any transient
VIN dip triggering the UVLO and causing the device to reset. For the input voltages between UVLO threshold
and 2.9V, the device maintains its operation, but the specifications are not ensured.
When the FB pin is shorted to ground or an LED fails open circuit, the output voltage can increase to potentially
damaging voltages. To present the IC and the output capacitor from exceeding the maximum voltage rating,
utilize the OVP pin with an external resistor divider to program an OVP threshold, as shown in the typical
application. The OVP pin is set at 1.229-V, and the OVP threshold should be higher than the normal operating
output voltage.
10
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS61500
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相关代理商/技术参数 |
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|---|---|
| TPS61500PWP | 制造商:Texas Instruments 功能描述:LED Driver IC 制造商:Texas Instruments 功能描述:IC, LED DRIVER, BOOST, HTSSOP-14 |
| TPS61500PWPR | 功能描述:LED照明驱动器 High Brightness LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS615B(F) | 制造商:Toshiba America Electronic Components 功能描述: |
| TPS615C(F) | 制造商:Toshiba America Electronic Components 功能描述: |
| TPS615F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Silicon NPN Epitaxial Planar |
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