參數(shù)資料
型號(hào)： TPS65120RGTT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, 0.90 MM HEIGHT, GREEN, PLASTIC, QFN-16
文件頁(yè)數(shù)： 7/30頁(yè)
文件大?。?/td> 1047K
代理商： TPS65120RGTT
www.ti.com
Enable and Power Sequencing (TPS65120/1/2/3)
SWN
TPS65120
D1
L1
C1
C3
R4
R3
SWP
FBL
VMAIN
FBM
C5
R6
R5
C4
BOOT
VGH
C2
FBH
RUN
EN
VIN
GATE
R10
R9
C7
P1
PGND
AGND
A
LDOIN
LDOOUT
VIN = 3.3 V
VGH
VLOGIC = 3.3 V
VGL
VMAIN
R1
R2
VIN
RUN
VLOGIC, EN
VMAIN
VGL
VGH
VBOOT
5.75V
GATE, EN_LDOAUX
TPS65120, TPS65121, TPS65123, TPS65124
SLVS531A – JUNE 2004 – REVISED MARCH 2005
DETAILED DESCRIPTION (continued)
To correctly power up most TFT panels, the gate-drive supplies must be sequenced such that the negative
supply (VGL) powers up before the positive supply (VGH). The TPS65120/1/2/3 controls this sequence through an
enable pin.
Once RUN is high, the TPS65120/1/2/3 turns on the external P-channel MOSFET P1 (see Figure 18) by pulling
GATE low. GATE is pulled down with a 100 k
resistor. The DC/DC converter then starts, enabling the BOOT
output.
Pulling the enable pin (EN) high enables the MAIN output. When the output voltage VMAIN has reached 90% of its
nominal value, the negative output enables. VGH is delayed until the negative voltage has reached 90% of its
nominal value.
Pulling the RUN pin low shuts down the device. Power-down sequencing starts by switching off VGH and VGL.
The VGH output capacitor is actively discharged by an internal resistor while VGL is only discharged by its
feedback voltage divider. The required time to discharge the output capacitor at VGL output depends on the load
current. Once VFBL has reached 1.2 V (typ) the main output is turned off followed by the output voltage VLOGIC.
This sequence is shown in Figure 19.
When no power sequencing is required on the digital supply voltage (VLOGIC), tie EN and RUN signals together
and GATE can be connected to a logic-high level to disable the power-down sequencer. Each output turns off
depending upon load current and output capacitance.
Figure 18. Power Sequencing on Digital Supply Voltage,
Figure 19. TPS65120/1/2/3 Power Sequence
VLOGIC
15
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS65120RGTTG4 功能描述:LCD 驅(qū)動(dòng)器 Sgl-Inductor Qd-Otp Supply 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
TPS65121RGTR 功能描述:LCD 驅(qū)動(dòng)器 Sgl-Inductor Qd-Otp Supply 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
TPS65121RGTRG4 功能描述:LCD 驅(qū)動(dòng)器 Sgl-Inductor Qd-Otp Supply 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
TPS65121RGTT 功能描述:LCD 驅(qū)動(dòng)器 Sgl-Inductor Qd-Otp Supply 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
TPS65121RGTTG4 功能描述:LCD 驅(qū)動(dòng)器 Sgl-Inductor Qd-Otp Supply 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
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