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参数资料
| 型号： | TPS65100QPWPRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | PLASTIC, TSSOP-24 |
| 文件页数： | 4/25页 |
| 文件大小： | 620K |
| 代理商： | TPS65100QPWPRQ1 |
Negative Charge Pump
Linear Regulator Controller
Soft Start
Fault Protection
Thermal Shutdown
SLVS849 – JULY 2008 ....................................................................................................................................................................................................... www.ti.com
The TPS65100 has a regulated negative charge pump using two external Schottky diodes. The input voltage for
the charge pump is applied to the SUP pin that is connected to the output of the main boost converter VO1. The
charge pump inverts the main boost converter output voltage and is capable of supplying a minimum load current
of 20 mA. Depending on the voltage difference between VO1 and VO2, higher load currents are possible (see
The TPS65100 includes a linear regulator controller to generate a 3.3-V rail which is useful when the system is
powered from a 5-V supply. The regulator is independent from the other voltage rails of the device and has its
own enable (ENR). Since most of the systems require this voltage rail to come up first it is recommended to use
a R-C delay on EN. This delays the start-up of the main boost converter which will reduce the inrush current as
well.
The main boost converter as well as the charge pumps, linear regulator, and VCOM buffer have an internal soft
start. This avoids heavy voltage drops at the input voltage rail or at the output of the main boost converter VO1
during start-up caused by high inrush currents (see Figure 10 and Figure 11). During softstart of the main boost
converter VO1, the internal current limit threshold is increased in three steps. The device starts with the first step,
where the current limit is set to 2/5 of the typical current limit (2/5 of 2.3 A) for 1024 clock cycles, then increased
to 3/5 of the current limit for 1024 clock cycles, and finally raised to the full current limit.
All the outputs of the TPS65100 have short-circuit detection that can force the device into shutdown. The main
boost converter has overvoltage and undervoltage protection. If the output voltage VO1 rises above the
overvoltage protection threshold of 5% of VO1 (typical), the device stops switching but remains operational. When
the output voltage falls below this threshold again, the converter continues operation. When the output voltage
falls below power good threshold of 8.75% of VO1 (typical), in case of a short-circuit condition, then the
TPS65100 goes into shutdown. Because there is a direct pass from the input to the output through the diode, the
short-circuit condition remains. If this condition needs to be avoided, a fuse at the input or an output disconnect
using a single transistor and resistor is required. The negative and positive charge pumps have an undervoltage
lockout to protect the LCD panel from possible latchup conditions in the event of a short-circuit condition or faulty
operation. When the negative output voltage is above 9.5% (typical) of its output voltage (closer to ground), the
device enters shutdown. When the positive charge pump output voltage VO3 is below 8% (typical) of its output
voltage, the device goes into shutdown as well. See the electrical characteristics table under fault protection
thresholds. The device can be enabled again by toggling the enable pin (EN) below 0.4 V or by cycling the input
voltage below the UVLO of 1.7 V. The linear regulator reduces the output current to typical 20 mA under a
short-circuit condition when the output voltage is < 1 V (typical). See the functional block diagram. The linear
regulator does not go into shutdown under a short-circuit condition.
A thermal shutdown is implemented to prevent damage due to excessive heat and power dissipation. Typically,
the thermal shutdown threshold is 160°C. If this temperature is reached, the device goes into shutdown. The
device can be enabled by toggling the enable pin to low and back to high or by cycling the input voltage to GND
and back to VI again.
12
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65100-Q1
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| TPS65100RGER | 功能描述:LCD 驱动器 Triple-Out TFT LCD Supply w/VCOM Buffer RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65100RGERG4 | 功能描述:LCD 驱动器 Triple-Out TFT LCD Supply w/VCOM Buffer RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65101PWP | 功能描述:LCD 驱动器 Triple Output LCD Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65101PWPG4 | 功能描述:LCD 驱动器 Triple Output LCD Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65101PWPR | 功能描述:LCD 驱动器 Triple Output LCD Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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