參數(shù)資料
型號: TPS51220ARTVR
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
封裝: 5 X 5 MM, PLASTIC, QFN-32
文件頁數(shù): 21/53頁
文件大?。?/td> 1380K
代理商: TPS51220ARTVR
SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
OVERVOLTAGE/UNDERVOLTAGE PROTECTION
TPS51220A monitors the output voltage to detect overvoltage and undervoltage. When the output voltage
becomes 15% higher than the target value, the OVP comparator output goes high and the circuit latches as the
high-side MOSFET driver OFF and the low-side MOSFET driver ON, and shuts off another channel.
When the feedback voltage becomes lower than 70% of the target voltage, the UVP comparator output goes
high and an internal UVP delay counter begins counting. After 1 ms, TPS51220A latches OFF both high-side and
low-side MOSFETs, and shuts off another channel. This UVP function is enabled after soft-start has completed.
OVP function can be disabled as shown in Table 4. The procedures for restarting from these protection states
are:
1. toggle EN
2. toggle EN1 and EN2 or
3. once hit UVLO
Table 4. FUNC Logic States
FUNC
GND
VREF2
VREG3
VREG5
OVP
Enable
Disable
Enable
Disable
CONTROL
Current mode
D-CAP mode
Current mode
SCHEME
UVLO PROTECTION
The TPS51220A has undervoltage lockout protections (UVLO) for VREG5, VREG3 and VREF2. When the
voltage is lower than UVLO threshold voltage, TPS51220A shuts off each output as shown inTable 5. This is
non-latch protection.
Table 5. UVLO Protection
CH1/ CH2
VREG5
VREG3
VREF2
VREG5 UVLO
Off
On
VREG3 UVLO
Off
Off
VREF2 UVLO
Off
On
THERMAL SHUTDOWN
The TPS51220A monitors the device temperature. If the temperature exceeds the threshold value, TPS51220A
shuts off both SMPS and 5V-LDO, and decreases the VREG3 current limitation to 5 mA (typically). This is
non-latch protection.
28
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51220A
相關(guān)PDF資料
PDF描述
TPS51221RTVRG4 DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32
TPS51315RGFR SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC40
TPS51315RGFT SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC40
TPS51317RGBT SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20
TPS51317RGBR SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS51220ARTVT 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51220ARTVT 制造商:Texas Instruments 功能描述:Controller IC
TPS51220ATRTVRQ1 功能描述:電流型 PWM 控制器 Current-Mode NB Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
TPS51220EVM 功能描述:電源管理IC開發(fā)工具 TPS51220EVM Hi Perf Synch Buck RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS51220RHBR 功能描述:電流型 PWM 控制器 Fixed Freq 99% Duty Cycle Peak Current RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14