參數(shù)資料
型號(hào)： TPS615
英文描述： PHOTOTRANSISTOR | NPN | 800NM PEAK WAVELENGTH | 20M | LED-2B
中文描述： 光電晶體管|叩| 800NM峰值波長(zhǎng)| 2000萬(wàn)|發(fā)光二極管- 2B衛(wèi)星
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 392K
代理商： TPS615
TPS61000, TPS61001, TPS61002, TPS61003, TPS61004, TPS61005, TPS61006, TPS61007
SINGLE-AND DUAL-CELL BOOST CONVERTER WITH START-UP INTO FULL LOAD
SLVS279B – MARCH 2000 – REVISED AUGUST 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
under-voltage lockout
An under-voltage lockout function prevents the device start-up if the supply voltage on V
BAT
is lower than
approximately 0.7 V. This under-voltage lockout function is implemented in order to prevent the malfunctioning
of the converter. When in operation and the battery is being discharged, the device will automatically enter the
shutdown mode if the voltage on V
BAT
drops below approximately 0.7 V.
If the EN pin is hardwired to V
BAT
and if the voltage at V
BAT
drops temporarily below the UVLO threshold voltage,
the device will switch off and will not start up again automatically, even if the supply voltage rises above 0.9 V.
The device will start up again only after a signal change from low to high on EN or if the battery voltage is
completely removed.
low Battery detector circuit (LBI and LBO)
The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag
when the battery voltage drops below a user-set threshold voltage. The function is active only when the device
is enabled. When the device is disabled, the LBO pin is high impedance. The LBO pin goes active low when
the voltage on the LBI pin decreases below the set threshold voltage of 500 mV
±
15 mV, which is equal to the
internal reference voltage. The battery voltage, at which the detection circuit switches, can be programmed with
a resistive divider connected to the LBI pin. The resistive divider scales down the battery voltage to a voltage
level of 500 mV, which is then compared to the LBI threshold voltage. The LBI pin has a built-in hysteresis of
10 mV. Please see the application section for more details about the programming of the LBI threshold.
If the low-battery detection circuit is not used, the LBI pin should be connected to GND (or to V
BAT
) and the LBO
pin can be left unconnected. Do not let the LBI pin float.
low-EMI switch
The device integrates a circuit which removes the ringing that typically appears on the SW-node when the con-
verter enters the discontinuous current mode. In this case, the current through the inductor ramps to zero and
the Schottky diode stops conducting. Due to remaining energy that is stored in parasitic components of diode,
inductor and switch, a ringing on the SW pin is induced. The integrated antiringing switch clamps this voltage
internally to V
BAT
and therefore dampens this ringing.
The antiringing switch is turned on by a comparator that monitors the voltage between SW and V
OUT
. This
voltage indicates when the diode is reverse biased. The ringing on the SW-node is damped to a large degree,
reducing the electromagnetic interference generated by the switching regulator to a very great extent.
adjustable output voltage (TPS61000 and TPS61007 only)
The accuracy of the internal voltage reference, the controller topology, and the accuracy of the external resistor
divider determine the accuracy of the adjustable output voltage versions. The reference voltage has an
accuracy of
±
4% over line, load, and temperature. The controller switches between fixed frequency and
pulse-skip mode, depending on load current. This adds an offset to the output voltage that is equivalent to 1%
of V
O
. Using 1% accurate resistors for the feedback divider, a total accuracy of
±
6% can be achieved over the
complete temperature and output current range. The TPS61007 is an improved adjustable output voltage
version. Ground shift in the feedback loop was eliminated by adding a separate ground pin for the feedback
resistor divider (FBGND).
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS615(F) 制造商:Toshiba America Electronic Components 功能描述: 制造商:Toshiba America Electronic Components 功能描述:Phototransistor Chip Silicon NPN Transistor 800nm 2-Pin T-1
TPS615_07 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Silicon NPN Epitaxial Planar
TPS61500 制造商:TI 制造商全稱:Texas Instruments 功能描述:3A Boost Converter for High Brightness LED Driver with Multiple Dimming Methods
TPS61500EVM-369 功能描述:LED 照明開(kāi)發(fā)工具 TPS61500EVM-369 Eval Mod RoHS:否 制造商:Fairchild Semiconductor 產(chǎn)品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝:
TPS61500PWP 功能描述:LED照明驅(qū)動(dòng)器 High Brightness LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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