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參數資料
| 型號： | ISL97644IRZ-TK |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Boost + LDO + VON Slice + VCOM |
| 中文描述： | 0.4 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-24 |
| 文件頁數： | 13/15頁 |
| 文件大?。?/td> | 544K |
| 代理商： | ISL97644IRZ-TK |
13
FN9228.0
April 11, 2006
Low to high transition is determined primarily by the switch
resistance and the external capacitive load. High to low
transition is more complex. Take the case where the block is
already enabled (VDPM is H). When VFLK is H, pin CE is
grounded. On the falling edge of VFLK, a current is passed
into pin CE, to charge an external capacitor to 1.2V. This
creates a delay, equal to CE * 4200. At this point, the output
begins to pull down from VGH to VDD1. The slew current is
equal to 300/(RE+5000)*Load Capacitance.
Start-Up Sequence
Figure 18 shows a detailed start up sequence waveform.
When V
IN
exceeds 2.5V and ENABLE reaches the VIH
threshold value, Boost converter and LDO start up, and gate
pulse modulator circuit output holds until VDPM goes to
high. Note that there is a DC path in the boost converter from
the input to the output through the inductor and diode, hence
the input voltage will be seen at output with a forward voltage
drop of diode before the part is enabled. If this voltage is not
desired, the following circuit can be inserted between input
and inductor to disconnect the DC path when the part is
disabled.
V
COM
Amplifier
The V
COM
amplifier is designed to control the voltage on the
back plate of an LCD display. This plate is capacitively
coupled to the pixel drive voltage which alternately cycles
positive and negative at the line rate for the display. Thus the
amplifier must be capable of sourcing and sinking capacitive
pulses of current, which can occasionally be quite large (a
few 100mA for typical applications).
The ISL97644 V
COM
amplifier's output current is limited to
400mA. This limit level, which is roughly the same for
sourcing and sinking, is included to maintain reliable
operation of the part. It does not necessarily prevent a large
temperature rise if the current is maintained. (In this case the
whole chip may be shut down by the thermal trip to protect
functionality.) If the display occasionally demands current
pulses higher than this limit, the reservoir capacitor will
provide the excess and the amplifier will top the reservoir
capacitor back up once the pulse has stopped. This will
happen on the μs time scale in practical systems and for
pulses 2 or 3 times the current limit, the V
COM
voltage will
have settled again before the next line is processed.
Fault Protection
ISL97644 provides the overall fault protections including
over current protection and over-temperature protection.
An internal temperature sensor continuously monitors the
die temperature. In the event that die temperature exceeds
the thermal trip point, the device will shut down and disable
itself. The upper and lower trip points are typically set to
140°C and 100°C respectively.
FIGURE 17. GATE PULSE MODULATOR TIMING DIAGRAM
DELAY TIME
CONTROLLED BY CE
SLOPE CONTROLLED
BY RE AND LOAD
CAPACITANCE
VGH
VDD_1
VDPM
VFLK
VGH_M
0
0
0
FIGURE 18. START-UP SEQUENCE
V
IN
VDPM
AVDD
0
0
0
ENABLE
0
LDO OUTPUT
VGH_M
VIN THRESHOLD
FIGURE 19. CIRCUIT TO DISCONNECT THE DC PATH OF
BOOST CONVERTER
INPUT
ENABLE
TO INDUCTOR
ISL97644
相關PDF資料 |
PDF描述 |
|---|---|
| ISL97645 | Boost + VON Slice + VCOM |
| ISL97645IRZ | Boost + VON Slice + VCOM |
| ISL97645IRZ-T | Boost + VON Slice + VCOM |
| ISL97645IRZ-TK | Boost + VON Slice + VCOM |
| ISL97646 | Boost + LDO + VON Slice + VCOM |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISL97645AIRZ | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645AIRZ-T | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645AIRZ-TK | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645IRZ-T | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| ISL97645IRZ-TK | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標準包裝:1 系列:- 應用:手持/移動設備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應商設備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
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