參數(shù)資料
型號(hào)： TPS65145RGE
廠商： Texas Instruments, Inc.
英文描述： TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD
中文描述： 三路輸出液晶供應(yīng)線性穩(wěn)壓器和電源良好
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 865K
代理商： TPS65145RGE
www.ti.com
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0.14
9
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15
Vo1 Output Voltage V
IO
Vo3 = 18 V (Doubler Mode)
T
A
= 25
°
C
T
A
= 85
°
C
T
A
= 40
°
C
0
0.02
0.04
0.06
0.08
0.10
0.12
9
10
11
12
13
14
15
Vo1 Output Voltage V
IO
Vo3 = 28 V (Tripler Mode)
T
A
= 25
°
C
T
A
= 85
°
C
T
A
= 40
°
C
DETAILED DESCRIPTION
The TPS65140/45 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 pump. The linear regulator controller is independent from
this system with its own enable pin. This 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. Refer to the
functional block diagram for more information.
Main Boost Converter
Power-Good Output
Enable and Power-On Sequencing (EN, ENR)
TPS65140
TPS65145
SLVS497B–SEPTEMBER 2003–REVISED MARCH 2004
TYPICAL CHARACTERISTICS (continued)
Vo3 MAXIMUM LOAD CURRENT
Vo3 MAXIMUM LOAD CURRENT
Figure 13.
Figure 14.
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 TPS65140/45 maintains continuous conduction even at light load currents.
This is achieved with a novel architecture using 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
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 a standard nonsynchronous boost converter and allows a simpler compensation for the boost
converter.
The TPS65140/45 has an open-drain power-good output with a maximum sink capability of 1 mA. The
power-good output goes high as soon as the main boost converter Vo1 and the negative and the positive charge
pumps are within regulation. The power-good output goes low as soon as one of the outputs is out of regulation.
In this case, the device goes into shutdown at the same time. See the electrical characteristics table for the
power-good thresholds.
The device has two enable pins. These pins should be terminated and not left floating to prevent faulty 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 pumps. The linear regulator has an
independent enable pin (ENR). Pulling this pin low disables the regulator, and pulling this pin high enables this
regulator.
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參數(shù)描述
TPS65145RGER 功能描述:LCD 驅(qū)動(dòng)器 Trp-Ch 1.3-A Swit Boost Converter 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
TPS65145RGERG4 功能描述:LCD 驅(qū)動(dòng)器 Trp-Ch 1.3-A Swit Boost Converter 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
TPS65146RGER 功能描述:LCD 驅(qū)動(dòng)器 Compact LCD Bias IC for Notebook & Mon 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
TPS65148RHBR 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
TPS65148RHBT 功能描述:LCD Gamma緩沖器 Compact TFT LCD Bias IC RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
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