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參數(shù)資料
| 型號(hào)： | TPS65170RHDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 19/35頁 |
| 文件大?。?/td> | 4698K |
| 代理商： | TPS65170RHDT |
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SLVSA27 – OCTOBER 2009
www.ti.com
Figure 33. Boost Converter and Positive Charge Pump Detailed Start-Up Behavior
The isolation switch is enabled when the GD pin goes low, tDLY seconds after RST goes high. When the isolation
switch turns on, VS rises at a rate determined by the RC network controlling the switch's gate and the amount of
capacitance on the output. The TPS65170 senses the rising VS via the CTRLP pin and 1ms after GD goes low
checks that VS ≈ VIN. If it is, then the boost converter is enabled. This scheme prevents the boost converter from
switching before the isolation switch is fully enabled, which could otherwise cause overvoltage conditions to
damage the switch node. If VS does not reach ≈VIN within 1ms of the GD pin going low, the TPS65170 detects
an error condition and the boost converter is not enabled.
The positive charge pump's short-circuit mode is enabled when the GD pin goes low. Although the boost
converter is not switching at this point, there is a DC path from VS to VGH and the output ramps up as current
flows into the collector capacitor and output capacitors. When VFBP reaches 100mV the IC determines that no
short-circuit exists and the output current from the CTRLP pin is disabled temporarily. (If there is no significant
load connected to VGH, the output voltage will remain almost constant, held-up by the output capacitance; if there
is a load, the output voltage will decay.) When the boost converter starts switching, the positive charge pump's
normal operation is enabled and VGH ramps up to its programmed value. (Note that the positive charge pump
implements a soft-start characteristic that ramps the current available from the CTRLP pin over time. This causes
the collector voltage of the regulating PNP to temporarily go negative.)
RESET GENERATOR
The reset generator generates an active low signal that can used to reset the timing controller used in LCD
applications. The RST output is an open-drain type and requires an external pull-up resistor. This signal is
typically pulled up to the 3.3V supply generated by the buck converter, which also supplies the timing controller's
I/O functions.
26
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS65170
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| TPS65171RHAR | 功能描述:LCD 驅(qū)動(dòng)器 Compact LCD Bias RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65175ARSHR | 制造商:Texas Instruments 功能描述:LCD BIAS CHIP AND LEVEL SHIFTE 制造商:Texas Instruments 功能描述:IC BIAS PWR SUPP FOR LCD 56VQFN 制造商:Texas Instruments 功能描述:Fully Programmable LCD Bias IC |
| TPS65175CRSHR | 功能描述:LCD TV/Monitor PMIC 56-VQFN (7x7) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 應(yīng)用:LCD 電視機(jī)/監(jiān)控器 電流 - 電源:- 電壓 - 電源:8.6 V ~ 14.7 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商器件封裝:56-VQFN（7x7） 標(biāo)準(zhǔn)包裝:1 |
| TPS65175RSHR | 功能描述:LCD 驅(qū)動(dòng)器 Fully Programmable LCD Bias IC RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65176RHDR | 功能描述:其他電源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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