參數(shù)資料
型號(hào)： TPS65162RGZR
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, PQCC48
封裝： 7 X 7 MM, PLASTIC, VQFN-48
文件頁(yè)數(shù)： 17/36頁(yè)
文件大?。?/td> 1034K
代理商： TPS65162RGZR
STEP-DOWN CONVERTER
Soft Start
Short Circuit Protection
PVIN
Regulator
8V
Sawtooth
Generator
Compensation
and
Softstart
Vref
Logic
Clock
500/750 kHz
Clock/2
Clock/4
0.9V
0.6V
Clockselectforshortcircuit
andsoftstart
ControlLogic
SWB
BOOT
FBB
Error Amplifier
Q3
SWB
Clock
Currentlimit
SLVS771B – MAY 2007 – REVISED JUNE 2008 ............................................................................................................................................................... www.ti.com
The TPS65162 step down converter block is shown in Figure 26. The non-synchronous step down converter
operates at a fixed switching frequency using a fast response voltage mode topology with input voltage
feedforward. This topology allows simple internal compensation and it is designed to operate with ceramic output
capacitors. The converter drives an internal 2.8 A N-Channel MOSFET switch. The MOSFET driver is referenced
to the switch pin SWB. The N-Channel MOSFET requires a gate drive voltage higher than the switch pin to turn
the N-Channel MOSFET on. This is accomplished by a boost strap gate drive circuit running of the step down
converter switch pin. When the switch pin SWB is at ground the boot strap capacitor is charged to 8 V. This way
the N-Channel Gate drive voltage is typically around 8 V.
To avoid high inrush current during startup, an internal soft-start is implemented. When the step down converter
is enabled over EN1, its reference voltage slowly rises from zero to its power good threshold of typically 90% of
Vref. When the reference voltage reaches this power good threshold, the Error amplifier is released to its normal
operation with its normal duty cycle. To further limit the inrush current during soft-start the converter frequency is
set to 1/4 of the switching frequency s and 1/2 of s by the comparator that monitors the feedback voltage. refer
to the internal block diagram. The typical soft-start is typically completed within 1ms.
To limit the short circuit current, the device has a cycle-by-cycle current limit. To prevent the short-circuit current
from rising above the internal current limit when the output is shorted to GND, the switching frequency is reduced
as well. This is implemented by two comparators monitoring the feedback voltage. The step-down converter
switching frequency is reduced to 1/2 of fs when the feedback is below 0.9 V, and 1/4 of the switching
frequency when the feedback voltage is below 0.6 V.
Figure 26. Step Down Converter Block TPS65162
24
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65162
相關(guān)PDF資料
PDF描述
TPS65167ARHARG4 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40
TPS65167RHAT 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40
TPS65170RHDT 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28
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TPS65182BRGZT POWER SUPPLY SUPPORT CKT, PQCC48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS65162RGZRG4 功能描述:LCD 驅(qū)動(dòng)器 12V/2.8A(I/O) 4-CH Multi-Converter 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
TPS65163RGZR 功能描述:其他電源管理 LCD Bias with Int 9Ch Level Shifter 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
TPS65163RGZT 功能描述:其他電源管理 LCD Bias with Int 9Ch Level Shifter 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
TPS65165EVM-233 功能描述:電源管理IC開(kāi)發(fā)工具 TPS65165 Evaluation Module RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS65165RSBR 功能描述:LCD Gamma緩沖器 Compact LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
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