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參數(shù)資料
| 型號(hào)： | TPS65150RGE |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Low Input Voltage, Compact LCD Bias IC With VCOM Buffer |
| 中文描述： | 低輸入電壓，緊湊型LCD偏置集成電路VCOM緩沖器 |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大?。?/td> | 1126K |
| 代理商： | TPS65150RGE |
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DETAILED DESCRIPTION
Main Boost Converter
The main boost converter operates with pulse width modulation (PWM) and a fixed switching frequency of 1.2
MHz. The converter uses an unique fast response, voltage mode controller scheme with input voltage
feedforward. This achieves excellent line and load regulation (0.16%/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 non-synchronous boost converter
topology operating in discontinuous conduction mode at light load current the TPS65150 maintains continuous
conduction even at light load currents. This is achieved by using the Virtual Synchronous Converter Technology
having an external Schottky diode with an integrated MOSFET in parallel connected between SW pin and the
SUP pin. See
Functional Block Diagram
. The intention of this MOSFET is to allow the current to go below ground
which is the case at light load conditions. For this purpose a small integrated P-Channel MOSFET, with typically
10-
R
DS(on)
, 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
standard non-synchronous boost converter and allows a simpler compensation for the boost converter.
Soft Start
The main boost converter as well as the charge pump driver have an internal soft-start circuit. This avoids heavy
voltage drops at the input voltage rail or at the output of the main boost converter Vs during startup caused by
high inrush currents. As the main boost converter starts up 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 2048 clock cycles then increased to 3/5 of the current limit for 2048 clock cycles and the 3
rd
step is
the full current limit. This gives a typical start-up time around 5 ms.
Adjustable Fault Delay
The TPS65150 has an adjustable delay timer integrated shutting down the entire device in case of a fault at the
outputs. The fault timer is also active during startup. Connecting a capacitor from the FDLY pin to Vin sets the
delay time, from the point where one of the outputs (VS, VGH, VGL) drops below its power good threshold, until
the device enters the shutdown latch. Since the fault delay timer is also active during startup, the device enters
shutdown when the output voltage of the main boost converter, Vs, does not reach its power-good threshold after
the fault delay time has passed. When an external isolation switch is used, shown in Figure 24, then the device
provides short circuit protection even during start-up. To restart the device, the input voltage has to be cycled to
GND. The shutdown function can be disabled by connecting FDLY to VIN. The fault delay time is calculated as:
t
F
= C
×
R = C
×
450 k
= 100 nF
×
450 k
≈
40 ms
Positive Charge Pump
The positive charge pump provides a regulated output voltage, set by the external resistor divider.
Figure 17
shows an extract of the positive charge pump driver circuit out of the block diagram. The operation of the charge
pump driver can be understood best by looking at
Figure 17
. During the first cycle Q3 is turned on and the flying
capacitor, Cfly, is charged to the source voltage, Vs. During the next clock cycle Q3 is turned off, and the current
source charges the drive pin, DRVP, up to the supply voltage, VSUP. Since the flying capacitor voltage sits on
top of the drive pin voltage the maximum output voltage is VGH=Vsup + Vs - Vdrop. Vdrop is the voltage drop
across the external diodes and internal charge pump MOSFETs.
TPS65150
SLVS576–SEPTEMBER 2005
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65150RGER | 功能描述:LCD 驅(qū)動(dòng)器 Compact LCD Bias Supply IC RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65150RGERG4 | 功能描述:LCD 驅(qū)動(dòng)器 Compact LCD Bias Supply IC RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65154RSLR | 制造商:Texas Instruments 功能描述:IC TRIPLE-OUT LCD SUPPLY 48VQFN |
| TPS65155RKPR | 功能描述:LCD 驅(qū)動(dòng)器 LCD Bias Solution RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| TPS65160APWP | 功能描述:其他電源管理 Bias Power Supply RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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