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参数资料
| 型号： | ISL97646IRZ-EVALZ |
| 厂商： | Intersil |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ISL97646 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步升 |
| 输出及类型： | 2，非隔离 |
| 电流 - 输出： | 350mA |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 650kHz，1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL97646 |
ISL97646
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
TO INDUCTOR
ENABLE
INPUT
equal to 300/(RE + 5000)*Load Capacitance.
FIGURE 19. CIRCUIT TO DISCONNECT THE DC PATH OF
BOOST CONVERTER
VDPM
0
V COM Amplifier
The V COM amplifier is designed to control the voltage on the
VFLK
VGH_M
0
SLOPE CONTROLLED
BY RE AND LOAD
CAPACITANCE
VGH
VDD_1
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
0
DELAY TIME
CONTROLLED BY CE
FIGURE 17. GATE PULSE MODULATOR TIMING DIAGRAM
Start-Up Sequence
Figure 18 shows a detailed start-up sequence waveform.
large (a few 100mA for typical applications).
The ISL97646 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
V IN
0
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
ENABLE
0
VIN THRESHOLD
pulses 2 or 3 times the current limit, the V COM voltage will
have settled again before the next line is processed.
VDPM
0
Fault Protection
ISL97646 provides the overall fault protections including
overcurrent protection and over-temperature protection.
0
AVDD
LDO OUTPUT
VGH_M
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
FIGURE 18. START-UP SEQUENCE
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.
13
+140°C and +100°C, respectively.
FN6265.1
December 14, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97646IRZ-T | 功能描述:直流/直流开关调节器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97646IRZ-TK | 功能描述:直流/直流开关调节器 ISL97646IRZOOST +L DO +VON SLICE +VCOM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97648IRTZ | 功能描述:IC BOOST DC/DC REG RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL97648IRTZ-T | 制造商:Intersil Corporation 功能描述:HIGH VOLTAGE TFT-LCD LOGIC DRIVER (56 LD TQFN 8X8) - Tape and Reel |
| ISL97648IRTZ-TK | 制造商:Intersil Corporation 功能描述:HIGH VOLTAGE TFT-LCD LOGIC DRIVER (56 LD TQFN 8X8) - Tape and Reel |
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