参数资料
型号: TPS54260EVM-597
厂商: Texas Instruments
文件页数: 14/52页
文件大小: 0K
描述: EVAL MODULE FOR TPS54260
标准包装: 1
系列: SWIFT™
主要目的: DC/DC,步降
输出及类型: 1,非隔离
输出电压: 3.3V
电流 - 输出: 2.5A
输入电压: 10.8 ~ 13.2 V
稳压器拓扑结构: 降压
频率 - 开关: 300kHz
板类型: 完全填充
已供物品:
已用 IC / 零件: TPS54260
其它名称: 296-30449
TPS54260EVM-597-ND
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
www.ti.com
DETAILED DESCRIPTION (continued)
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 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.
è ?
? Vout  -  0.8V ?
R1 = R2 ′ ? ÷
0.8 V
(1)
Enable and Adjusting Undervoltage Lockout
The TPS54260 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 27 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 m A that provides the default condition of the TPS54260 operating when the EN pin floats. Once the EN pin
voltage exceeds 1.25V, an additional 2.9 m A 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.
TPS54260
VIN
R1
I1
0.9 m A
+
Ihys
2.9 m A
R2
EN
1.25 V
-
Figure 27. Adjustable Undervoltage Lockout (UVLO)
- V
R1 = START STOP
V
I HYS
(2)
R2 =
V ENA
V START - V ENA
R1
+ I 1
(3)
Another technique to add input voltage hysteresis is shown in Figure 28 . 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
Product Folder Link(s): TPS54260
Copyright ? 2010, Texas Instruments Incorporated
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