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参数资料
| 型号： | TPS65101PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 3/30页 |
| 文件大小： | 1213K |
| 代理商： | TPS65101PWP |
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Positive Charge Pump
Negative Charge Pump
Linear Regulator Controller
Soft Start
Fault Protection
SLVS496C – SEPTEMBER 2003 – REVISED APRIL 2006
DETAILED DESCRIPTION (continued)
pump comes up next. The negative charge pump starts with a soft start and when the output voltage has
reached 91% of the nominal value, the positive charge pump comes up with a soft start. The VCOM buffer is
enabled as soon as the positive charge pump has reached its nominal value and VCOMIN is greater than
typically 1.0 V. Pulling the enable pin low shuts down the device. Depended on load current and output
capacitance, each of the outputs goes down.
The TPS6510x series has a fully regulated integrated positive charge pump generating VO3. The input voltage
for the charge pump is applied to the SUP pin that is equal to the output of the main boost converter VO1. The
charge pump is capable of supplying a minimum load current of 20 mA. Depending on the voltage difference
between VO1 and VO3 higher load currents are possible. See Figure 13 and Figure 14.
The TPS6510x series 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 Figure 12.
The TPS6510x series 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 2.3A) for 1024 clock cycles then increased
to 3/5 of the current limit for 1024 clock cycles and the 3rd step is the full current limit. The TPS65101 has an
extended softstart time where each step is 2048 clock cycles.
All the outputs of the TPS65100/05 have short circuit detection where the device enters shutdown. The
TPS65101, as an exception, does not enter shutdown in case one of the outputs falls below its power good
threshold. The main boost converter has overvoltage and undervoltage protection. If the output voltage VO1 rises
above the overvoltage protection threshold of typically 5% of VO1, then the device stops switching but remains
operational. When the output voltage falls below this threshold again, then the converter continues operation.
When the output voltage falls below power good threshold of typically 8.75% of VO1, in case of a short circuit
condition, then the TPS65100/05 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 of possible latch-up conditions in case of a short circuit
condition or faulty operation. When the negative output voltage is typically above 9.5% of its output voltage
(closer to ground), then the device enters shutdown. When the positive charge pump output voltage VO3 is
below 8% typ of its output voltage, then 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 typically < 1 V. See the functional block
diagram. The linear regulator does not go into shutdown under a short-circuit condition.
11
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| 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 |
| TPS65101PWPRG4 | 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 |
| TPS65101RGER | 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 |
| TPS65101RGERG4 | 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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