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參數(shù)資料
| 型號(hào)： | DS4426T+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 14/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC I2C-MARGINING 4CH 28-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 8 |
| 數(shù)據(jù)接口： | I²C |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 28-WFQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 28-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類(lèi)型： | 4 電流，單極 |
| 采樣率（每秒）： | * |
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DS4426
THR Inputs for Enabling
Power-Supply Tracking
Comparators are used to individually enable/disable
power-supply tracking based on the voltage presented
to the corresponding THR pin relative to a fixed internal
reference (VREF/2 = +0.62V). Figure 4 shows a typical
startup and shutdown plot based on the voltage pre-
sented to the THR pin. Tracking can be disabled by
connecting the corresponding THR pin to a voltage
greater than VREF/2. Below this threshold, the tracking
circuit is active.
Power-Supply Tracking in DC-DC
Power Applications
The DS4426 provides several options for power-supply
tracking control of DC-DC power supplies. In many
cases, it is desirable to prevent certain DC-DC supplies
from exceeding the voltage of other supplies. This is
often the case with the voltages applied to a digital
core and I/O. Each DS4426 supports one master with
three slave DC-DCs. See Figure 5 for more information.
Loop Bandwidth Consideration
Power-supply tracking is used to override each slave
DC-DC’s feedback loop during power-up and power-
down. Power-supply tracking is capable of slewing at a
much faster rate than most DC-DC converters. Care
must be exercised when selecting the loop bandwidth
of the master DC-DC, slave DC-DC, and power-supply
tracking control loop such that oscillations and over-
shoot are minimized.
While the slave DC-DC supplies are tracking the master
DC-DC supply, there are three time constants of concern:
1) Master BW. The master DC-DC control loop band-
width, power-up ramp rate, and power-down ramp
rate.
2) Slave BW. The slave DC-DC supplies control loop
bandwidths.
3) Tracking BW. The DS4426 tracking circuit band-
width.
To ensure stable operation and minimize peaking, the
bandwidths should follow the following rule:
Master BW and Slave BW < (Tracking BW/10)
Quad-Channel, I2C-Margining IDACs with
Three Channels of Power-Supply Tracking
8
_______________________________________________________________________________________
V
DS4426 TRACKING DISABLED
GAIN
ERROR
TRACKING RANGE: DS4426 OVERRIDES SLAVE'S FEEDBACK LOOP
VMASTER
VSLAVE
VTHRESHOLD
t
Figure 4. Enabling Power-Supply Tracking Using the THR Input
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS443 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| DS4432 | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Dual-Channel, I2C, 7-Bit Sink/Source Current DAC |
| DS4432U+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 2Ch I2C Adj Sink-Source RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DS4432U+T&R | 制造商:Maxim Integrated Products 功能描述:DUAL-CHANNEL, I?C ADJUSTABLE SINK/SOURCE CURRENT DAC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:MXMDS4432U+T&R DUAL-CHANNEL, I?°?C ADJUSTA 制造商:Maxim Integrated Products 功能描述:IC DAC 7BIT 2CH 5.5V 8-MSOP |
| DS4432U+T&R | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 2Ch I2C Adj Sink-Source RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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