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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： | 3/25页 |
| 文件大小： | 620K |
| 代理商： | TPS65100QPWPRQ1 |
DETAILED DESCRIPTION
Main Boost Converter
VCOM Buffer
Enable and Power On Sequencing (EN, ENR)
Positive Charge Pump
www.ti.com ....................................................................................................................................................................................................... SLVS849 – JULY 2008
The TPS65100 consists of a main boost converter operating with a fixed switching frequency of 1.6 MHz to allow
for small external components. The boost converter output voltage VO1 is also the input voltage, connected via
the pin SUP, for the positive and negative charge pumps and the bias supply for the VCOM buffer. The linear
regulator controller is independent from this system with its own enable pin. This design allows the linear
regulator controller to continue to operate while the other supply rails are disabled or in shutdown due to a fault
condition on one of their outputs. See the functional block diagram for more information.
The main boost converter operates with PWM and a fixed switching frequency of 1.6 MHz. The converter uses a
unique fast-response voltage-mode controller scheme with input voltage feedforward. This achieves excellent line
and load regulation (0.2%/A load regulation typical) and allows the use of small external components. To add
higher flexibility to the selection of external component values the device uses external loop compensation.
Although the boost converter looks like a nonsynchronous boost converter topology operating in discontinuous
mode at light load, the TPS65100 maintains continuous conduction even at light load currents. This is
accomplished using the Virtual Synchronous Converter Technology for improved load transient response. This
architecture uses an external Schottky diode and an integrated MOSFET in parallel connected between SW and
SUP (see the functional block diagram). The integrated MOSFET Q2 allows the inductor current to become
negative at light load conditions. For this purpose, a small integrated P-channel MOSFET with typically 10-
rDSon is sufficient. When the inductor current is positive, the external Schottky diode with the lower forward
voltage conducts the current. This causes the converter to operate with a fixed frequency in continuous
conduction mode over the entire load current range. This avoids the ringing on the switch pin as seen with a
standard nonsynchronous boost converter and allows a simpler compensation for the boost converter.
VCOMIN is the input of the VCOM buffer. If the VCOM buffer is not required for certain applications, it is possible
to shut down the VCOM buffer by connecting VCOMIN to ground, reducing the overall quiescent current. The
VCOM buffer features soft start, avoiding a large voltage drop at VO1 during start-up. The VCOMIN cannot be
pulled dynamically to ground during operation.
The device has two enable pins. These pins should be terminated and should not be left floating to prevent
unpredictable operation. Pulling the enable pin (EN) high enables the device and starts the power-on sequencing
with the main boost converter VO1 coming up first, then the negative and positive charge pump and the VCOM
buffer. If the VCOMIN pin is held low, the VCOM buffer remains disabled. The linear regulator has an
independent enable pin (ENR). Pulling this pin low disables the regulator, and pulling this pin high enables this
regulator.
If the enable pin EN is pulled high, the device starts its power on sequencing. The main boost converter starts up
first with its soft start. If the output voltage has reached 91.25% of its output voltage, the negative charge 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 TPS65100 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
Copyright 2008, Texas Instruments Incorporated
11
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 |
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| 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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