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| 型号： | TPS60252RTER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.65 A SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 2/25页 |
| 文件大小： | 762K |
| 代理商： | TPS60252RTER |
x1 Operating
Area
x1.5 Operating
Area
V
I
V
I
V
O
VA
VF
VDX
CP WLEDDriver
VB
VC
VHYS
SLVS769C – APRIL 2007 – REVISED APRIL 2008............................................................................................................................................................ www.ti.com
Figure 13. Input Voltage Hysteresis Between
×1 and ×1.5 Mode
As shown in Figure 13, there is input hysteresis voltage between 1
× and 1.5× mode to ensure stable operation
during mode transition. For the 1 cell Li-Ion battery input voltage range, the TPS6025/2 operate in 1
× mode when
a fully charged battery is installed. Once the battery voltage drops below the VB level, which is the mode
transition voltage from 1
× to 1.5×, the WLED driver operates in 1.5× mode. Once in 1.5× mode, the battery
voltage must rise to the VC level in order to transition from 1.5× to 1×. This hysteresis ensures stable operation
when there is some input voltage fluctuation at the 1
×/1.5× mode transition.
The transition voltage, VB, depends on VDX (the mode transition threshold voltage), VF (WLED forward voltage
drop) and VA (the drop out voltage of the charge pump stage) and is calculated as follows:
VB = VA + VF + VDX
VA = ROUT1X × ILEDTOTAL
Where ROUT1X is the 1× mode output impedance of the IC. See the Electrical Characteristics table for output
impedance specifications.
The TPS60250/2 switch up to 1.5
× mode when the input voltage is below V
B and remain in 1.5× mode as long as
the input is lower than VC. 1.5× Mode is exited when the input voltage rises above VC. VC is calculated as:
VC = VF + 550 mV
The input voltage mode transition hysteresis voltage (VHYS) between 1× and 1.5× is calculated using the following
equation.
VHYS = VC – VB = 550 mV – VDX – VA, where VDX = 100mV
Note that VA is the key factor in determining VHYS and is dependant on the 1× mode charge pump output
impedance and WLED current.
10
Copyright 2007–2008, Texas Instruments Incorporated
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| TPS60252RTERG4 | 功能描述:LED照明驱动器 Hi Eff Charge Pump for 7 WLEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS60252RTET | 功能描述:LED照明驱动器 High Eff Charge Pump for 7 WLEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS60252RTETG4 | 功能描述:LED照明驱动器 Hi Eff Charge Pump for 7 WLEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS60255 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs DRIVER WITH 1 WIRE INTERFACE |
| TPS60255EVM-262 | 功能描述:电源管理IC开发工具 TPS60255EVM-262 EVAL MOD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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