参数资料
型号: TPS54478RTER
厂商: Texas Instruments
文件页数: 12/38页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 16WQFN
标准包装: 3,000
系列: SWIFT™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 4.5 V
输入电压: 2.95 V ~ 6 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 4A
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: 16-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 16-WQFN 裸露焊盘(3x3)
SLVSAS2 – JUNE 2011
R1
V O
VSENSE
TPS54478
R2
0.6 V
+
Figure 21. Voltage Divider Circuit
ENABLE AND ADJUSTING UNDER-VOLTAGE LOCKOUT
The TPS54478 is disabled when the VIN pin voltage falls below 2.6 V. If an application requires a higher
under-voltage lockout (UVLO), use the EN pin as shown in Figure 22 to adjust the input voltage UVLO by using
two external resistors. It is recommended to use the EN resistors to set the UVLO falling threshold (V STOP ) above
2.6V. The rising threshold (V START ) should be set to provide enough hysteresis to allow for any input supply
variations. The EN pin has an internal pull-up current source that provides the default condition of the TPS54478
operating when the EN pin floats. Once the EN pin voltage exceeds 1.30 V, an additional 2.76 μ A of hysteresis is
added. When the EN pin is pulled below 1.21 V, the 2.76 μ A is removed. This additional current facilitates input
voltage hysteresis.
TPS54478
R1
VIN
ip
0.64 m A
i hys
2.76 m A
R2
EN
Vena
+
Figure 22. Adjustable Under Voltage Lock Out
? V ENFALLING ?
R1 =
V START ? ÷ - V STOP
è V ENRISING ?
? V ?
I p ? 1 - ENFALLING ÷ + I h
è V ENRISING ?
(2)
vertical spacer
R2 =
R1 ′ V ENFALLING
V STOP - V ENFALLING + R1 ( I p + I h )
(3)
Where I h = 2.76uA, I p = 0.64uA, V ENRISING = 1.30V, V ENFALLING = 1.21V
12
Copyright ? 2011, Texas Instruments Incorporated
相关PDF资料
PDF描述
TPS54550PWPG4 IC REG BUCK SYNC ADJ 6A 16HTSSOP
TPS54678RTER IC REG BUCK SYNC ADJ 6A 16WQFN
TPS54900PWRG4 IC REG BUCK ADJ .1A QUAD 16TSSOP
TPS60110PWPG4 IC REG BST SWITCHED CAP 20HTSSOP
TPS62125DSGT IC REG BUCK SYNC ADJ 0.3A 8WSON
相关代理商/技术参数
参数描述
TPS54478RTET 功能描述:直流/直流开关调节器 2.95V-6Vin,6A,Sync Step-Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
TPS54494 制造商:TI 制造商全称:Texas Instruments 功能描述:4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54494EVM-057 制造商:Texas Instruments 功能描述:Evaluation Module Access To The Features Of The TPS54494 制造商:Texas Instruments 功能描述:TPS54494EVM-057 - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:EVAL MODULE FOR TPS54494-057 制造商:Texas Instruments 功能描述:TPS54494 Eval Mod
TPS54494PWP 功能描述:直流/直流开关转换器 4A Dual Channel Sync SD Switcher RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
TPS54494PWPR 功能描述:直流/直流开关转换器 4A Dual Channel Sync SD Switcher RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT