- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄369714 > L6917BD (意法半導(dǎo)體) 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER PDF資料下載
參數(shù)資料
| 型號： | L6917BD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| 中文描述： | 5位可編程雙相控制器 |
| 文件頁數(shù)： | 9/27頁 |
| 文件大?。?/td> | 411K |
| 代理商： | L6917BD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
9/27
L6917
Digitalto Analog Converter
The built-in digital to analog converter allows the adjustment of the output voltage from 1.100V to 1.850V with
25mV steps as shown in the previous table 1. The internal reference is trimmed to ensure the precision of 0.8%
and a zero temperature coefficient around 70
°
C. The internal reference voltage for the regulation is pro-
grammed by the voltage identification (VID) pins. These are TTL compatible inputs of an internal DAC that is
realized by means of a series of resistors providing a partition of the internal voltage reference. The VID code
drives a multiplexer that selects a voltage on a precise point of the divider. The DAC output is delivered to an
amplifier obtaining the V
PROG
voltage reference (i.e. the set-point of the error amplifier). Internal pull-ups are
provided (realized with a 5
μ
A current generator up to 3.3V max); in this way, to program a logic ”1” it is enough
to leave the pin floating, while to program a logic ”0” it is enough to short the pin to GND.
The voltage identification (VID) pin configuration also sets the power-good thresholds (PGOOD) and the over-
voltage protection (OVP) thresholds.
SoftStartand INHIBIT
At start-up a ramp is generated increasing the loop reference from 0V to the final value programmed by VID in
2048 clock periods as shown in figure 2.
Before soft start, the lower power MOS are turned ON after that V
CCDR
reaches 2V (independently by Vccvalue)
to discharge the output capacitor and to protect the load from high side mosfet failures. Once soft start begins,
the reference is increased; when it reaches the bottom of the oscillator triangular waveform (1V typ) also the
upper MOS begins to switch and the output voltage starts to increase with closed loop regulation. At the end of
the digital soft start, the Power Good comparator is enabled and the PGOOD signal is then driven high (See fig.
2). The Negative Current Limit comparators and Under Voltage comparator are enabled when the reference
voltage reaches 0.8V.
The Soft-Start willnot take place, if both Vcc and VCCDR pins are not above their own turn-on thresholds. Dur-
ing normal operation, if any under-voltage is detected on one of the two supplies the device shuts down.
Forcing the OSC/INH/FAULT pin to a voltage lower than 0.8V the device enter in INHIBIT mode: all the power
mosfets are turned off until this condition is removed. When this pin is freed, the OSC/INH/FAULT pin reaches
the band-gap voltage and the soft start begins.
Figure 2. Soft Start
V
IN
=V
CCDR
V
LGATEx
PGOOD
V
OUT
t
t
t
t
2V
Turn ON threshold
2048 Clock Cycles
Timing Diagram
Acquisition:
CH1 = PGOOD; CH2 = V
OUT
; CH4 = LGATEx
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6917BDTR | 5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER |
| L6OV12 | Analog IC |
| L6OV15 | Analog IC |
| L6OV24 | Analog IC |
| L6OV5 | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6917BDTR | 功能描述:DC/DC 開關(guān)控制器 Prog Dual-Phase Cont RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| L6917D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6917DTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| L6918 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。