參數(shù)資料
型號(hào)： TPS2554DRCT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PDSO10
封裝： PLASTIC, SON-10
文件頁(yè)數(shù)： 7/23頁(yè)
文件大小： 1035K
代理商： TPS2554DRCT
MIN
1.037
ILIMx
48000
IOS
2500mA
R
=
1
1.037
ILIMx
MIN
48000
R
17.28k
IOS
2500mA
é
ù
é
ù
=
ê
ú
ê
ú
ILIMx
17.28k
R
17.11k
1.01
=
ILIMx
R
16.9k
=
SLVSAM0
– JUNE 2011
Current Limit Setpoint Example
In the following example, choose the ILIM resistor to ensure that the TPS2554/55 does not trip off under
worst-case conditions of ILIM and resistor tolerance (assume 1% initial-plus-temperature resistor tolerance). For
this example IOSMIN = 2500 mA.
(5)
(6)
Including resistor tolerance, target maximum:
(7)
Choose:
(8)
Layout Guidelines
TPS2554/55 Placement: Place the TPS2554/55 near the USB output connector and 150-
F OUT pin filter
capacitor. Connect the exposed PowerPad
to the GND pin and to the system ground plane using a via array.
IN Pin Bypass Capacitance: Place the 100-nF bypass capacitor near the IN and GND pins, and make the
connections using a low-inductance trace.
ILIM0 and ILIM1 Pin Connections: Current-limit, set-point accuracy can be compromised by stray current
leakage from a higher voltage source to the ILIM0 or ILIM1 pins. Ensure that there is adequate spacing between
IN pin copper/trace and ILIM0 pin trace to prevent contaminant buildup during the PCB assembly process. If a
low-current-limit set point is required (RILIMx > 200 kΩ), use ILIM1 for this case as it is further away from the IN
pin.
Copyright
2011, Texas Instruments Incorporated
15
Product Folder Link(s): TPS2554 TPS2555
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