參數(shù)資料
型號： TPS54240QDGQRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁數(shù)： 8/48頁
文件大?。?/td> 1447K
代理商： TPS54240QDGQRQ1
START
STOP
OUT
HYS
V
R1
V
I
R3
-
=
+
ENA
START
ENA
1
V
R2
V
I
R1
R3
=
-
+ -
VIN
R1
R2
Node
5.8V
10kohm
ENA
Tss(ms)
Iss( A)
Css(nF) =
Vref (V)
0.8
m
SLVSAQ4A
– DECEMBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION (continued)
(4)
(5)
Do not place a low-impedance voltage source with greater than 5 V directly on the EN pin. Do not place a
capacitor directly on the EN pin if VEN > 5 V when using a voltage divider to adjust the start and stop voltage.
The node voltage, (see Figure 29) must remain equal to or less than 5.8 V. The zener diode can sink up to 100
A. The EN pin voltage can be greater than 5 V if the VIN voltage source has a high impedance and does not
source more than 100
A into the EN pin.
Figure 29. Node Voltage
Slow Start/Tracking Pin (SS/TR)
The TPS54240-Q1 effectively uses the lower voltage of the internal voltage reference or the SS/TR pin voltage
as the power-supply's reference voltage and regulates the output accordingly. A capacitor on the SS/TR pin to
ground implements a slow start time. The TPS54240-Q1 has an internal pull-up current source of 2
μA that
charges the external slow start capacitor. The calculations for the slow start time (10% to 90%) are shown in
Equation 6. The voltage reference (VREF) is 0.8 V and the slow start current (ISS) is 2μA. The slow start capacitor
should remain lower than 0.47
μF and greater than 0.47nF.
(6)
At power up, the TPS54240-Q1 will not start switching until the slow start pin is discharged to less than 40 mV to
ensure a proper power up, see Figure 30.
Also, during normal operation, the TPS54240-Q1 will stop switching and the SS/TR must be discharged to 40
mV, when the VIN UVLO is exceeded, EN pin pulled below 1.25V, or a thermal shutdown event occurs.
The VSENSE voltage will follow the SS/TR pin voltage with a 45mV offset up to 85% of the internal voltage
reference. When the SS/TR voltage is greater than 85% on the internal reference voltage the offset increases as
the effective system reference transitions from the SS/TR voltage to the internal voltage reference (see
Figure 23). The SS/TR voltage will ramp linearly until clamped at 1.7V.
16
Copyright
2010–2011, Texas Instruments Incorporated
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TPS54260_2 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.5V to 60V INPUT, 2.5A, STEP DOWN CONVERTER WITH ECO-MODE?
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