参数资料
型号: TPS54260DRCR
厂商: Texas Instruments
文件页数: 15/52页
文件大小: 0K
描述: IC REG BUCK ADJ 2.5A 10SON
标准包装: 3,000
系列: SWIFT™, Eco-Mode™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 58 V
输入电压: 3.5 V ~ 60 V
PWM 型: 电流模式
频率 - 开关: 100kHz ~ 2.5MHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 10-VFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-SON 裸露焊盘(3x3)
www.ti.com
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
DETAILED DESCRIPTION (continued)
TPS54260
VIN
Ihys
R1
I1
0.9 m A
+
2.9 m A
R2
EN
1.25 V
R3
-
VOUT
Figure 28. Adding Additional Hysteresis
I HYS + OUT
V START - V ENA
+ I 1 - ENA
R1 =
R2 =
V START - V STOP
V
R3
V ENA
V
R1 R3
(4)
(5)
Slow Start/Tracking Pin (SS/TR)
The TPS54260 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 TPS54260 has an internal pull-up current source of 2 m A 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 (V REF ) is 0.8 V and the slow start current (I SS ) is 2 m A. The slow start capacitor should
remain lower than 0.47 m F and greater than 0.47nF.
Css(nF) =
Tss(ms) Iss( m A)
Vref (V) ′ 0.8
(6)
At power up, the TPS54260 will not start switching until the slow start pin is discharged to less than 40 mV to
ensure a proper power up, see Figure 29 .
Also, during normal operation, the TPS54260 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.
Copyright ? 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54260
15
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