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參數(shù)資料
型號(hào): 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
文件大小: 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
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