參數(shù)資料
型號(hào)： TPS54140QDRCRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO10
封裝： GREEN, PLASTIC, SON-10
文件頁(yè)數(shù)： 6/50頁(yè)
文件大小： 1602K
代理商： TPS54140QDRCRQ1
Vout
0.8V
R1 = R2
0.8 V
-
÷
è
EN
VIN
+
-
TPS54140
R 1
R 2
Ihys
I1
0.9 A
m
1.25V
2.9 A
m
START
STOP
HYS
V
R1
I
-
=
ENA
START
ENA
1
V
R2
V
I
R1
=
-
+
SLVSA24B
– OCTOBER 2009 – REVISED MARCH 2011
DETAILED DESCRIPTION (continued)
Voltage Reference
The voltage reference system produces a precise
±2% voltage reference over temperature by scaling the output
of a temperature stable bandgap circuit.
Adjusting the Output Voltage
The output voltage is set with a resistor divider from the output node to the VSENSE pin. It is recommended to
use 1% tolerance or better divider resistors. Start with a 10 k
for the R2 resistor and use the Equation 1 to
calculate R1. To improve efficiency at very light loads consider using larger value resistors. If the values are too
high the regulator will be more susceptible to noise and voltage errors from the VSENSE input current will be
noticeable
(1)
Enable and Adjusting Undervoltage Lockout
The TPS54140 is disabled when the VIN pin voltage falls below 2.5 V. If an application requires a higher
undervoltage lockout (UVLO), use the EN pin as shown in Figure 28 to adjust the input voltage UVLO by using
the two external resistors. Though it is not necessary to use the UVLO adjust registers, for operation it is highly
recommended to provide consistent power up behavior. The EN pin has an internal pull-up current source, I1, of
0.9
μA that provides the default condition of the TPS54140 operating when the EN pin floats. Once the EN pin
voltage exceeds 1.25V, an additional 2.9
μA of hysteresis, Ihys, is added. This additional current facilitates input
voltage hysteresis. Use Equation 2 to set the external hysteresis for the input voltage. Use Equation 3 to set the
input start voltage.
Figure 28. Adjustable Undervoltage Lockout (UVLO)
(2)
(3)
Another technique to add input voltage hysteresis is shown in Figure 29. This method may be used, if the
resistance values are high from the previous method and a wider voltage hysteresis is needed. The resistor R3
sources additional hysteresis current into the EN pin.
14
Copyright
2009–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54140-Q1
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