參數(shù)資料
型號(hào)： TPS5140PAGR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 2/61頁(yè)
文件大?。?/td> 1181K
代理商： TPS5140PAGR
TPS5140
FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
OVP
For over voltage protection, the TPS5140 monitors INV terminal voltage. When the INV voltage becomes higher
than 1.185 V (+12%), the OVP comparator output becomes high and the SCP timer starts to charge the SCP
capacitor. After a programmable time delay, the SCP circuit forces CH1, 2, 3 high-side MOSFET drivers to latch
off and the low-side MOSFET drivers to latch on.
UVP
For under voltage protection, the TPS5140 monitors INV terminal voltage. When the INV voltage becomes lower
than 1.185 V (–18 %), the UVP comparator output becomes high and the SCP timer starts to charge the SCP
capacitor. Also, when the current comparator of CH1, 2, 3 triggers the OCP, the UVP comparator detects the
under voltage output and the SCP capacitor starts to charge. After the programmable time delay, the SCP circuit
forces the CH1, 2, 3 MOSFET drivers to latch off.
SCP
When an OVP or UVP comparator output becomes high, the SCP circuit starts to charge the SCP capacitor.
The charging source current value is different between OVP alert and UVP alert.
SCP source current (OVP) = SCP source current (UVP)
× 5
The threshold voltage of SCP comparator is 1.185 V.
power good
The power good output reports the output fail condition. PG comparators monitor an under voltage or over
voltage of CH1, 2, 3, with a threshold of –7 % and 7 %. TPS5140 has an EXT_PG terminal, which can be used
for the input of an external PG signal. Delay time is programmable by charging an external capacitor on the
PG_DELAY terminal.
SOFTSTART1, 2, 3
Separate soft start terminals make it possible to customize the start-up time of each output. The voltage on the
charging softstart capacitor gradually raises, limiting the surge current and voltage. A soft start is initiated when
the STBY terminals are switched.
STBY1, 2, 3, 12V
CH1, 2, 3 and 12V can be switched into standby mode separately by grounding the STBY terminal.
STBY_VREF3.3, 5V
STBY_VREF3.3 shuts down the 3.3-V regulator by grounding the STBY_VREF3.3 terminal. When
STBY_VREF5 is high, only the 5-V regulator is operating.
UVLO
When the input voltage exceeds 4 V, the IC is turned on and is ready to function. When the input voltage is lower
than the turn on value, the IC is turned off. The typical hysteresis voltage is 40 mV.
phase inverter
The phase inverter controls the phase of CH1 and CH2, 3. CH2, 3 operate in the same phase as OSC. CH1
operates 180
° out of phase from OSC. Out-of-phase operation enables a smaller input capacitor.
OVP (12-V boost converter)
The TPS5140 monitors over voltage of the12-V boost converter. When an output over voltage is detected, the
timer starts to charge an external capacitor that is connected to the SCP terminal. After a programmable time
delay, the SCP circuit forces all (CH1, 2, 3 and 12 V) MOSFET drivers to latch-off.
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