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參數(shù)資料
| 型號： | L6919CD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | SO-28 |
| 文件頁數(shù)： | 32/32頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6919CD |
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L6919C
DIGITAL TO ANALOG CONVERTER
The built-in digital to analog converter allows the adjustment of the output voltage from 0.800V to 1.550V with
25mV as shown in the previous table 1. The internal reference is trimmed to ensure output voltage precision of
±0.6% 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 VPROG voltage reference (i.e. the set-point of the error amplifier). Internal pull-ups are
provided (realized with a 5
A current generator up to 3.3V Typ); 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. Programming the
"11111" code, the device enters the NOCPU mode: all mosfets are turned OFF and protections are diabled. The
condition is latched.
The voltage identification (VID) pin configuration also sets the power-good thresholds (PGOOD) and the Over
/ Under Voltage protection (OVP/UVP) thresholds.
DYNAMIC VID TRANSITION
The device is able to manage On-The-Fly VID Code changes that allow Output Voltage modification during nor-
mal device operation. The device checks every clock cycle (synchronously with the PWM ramp) for VID code
modifications. Once the new code is stable for more than one clock cycle, the reference steps up or down in
25mV increments every clock cycle until the new VID code is reached. During the transition, VID code changes
are ignored; the device re-starts monitoring VID after the transition has finished. PGOOD, signal is masked dur-
ing the transition and it is re-activated after the transition has finished while OVP / UVP are still active.
Figure 2. Dynamic VID transition
SOFT START AND 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 3.
Before soft start, the lower power MOS are turned ON after that VCCDR reaches 2V (independently by Vcc val-
ue) to discharge the output capacitor and to protect the load from high side mosfet failures. Once soft start be-
gins, the reference is increased; 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. 3). The Under Voltage comparator enabled when the reference volt-
age reaches 0.8V. The Soft-Start will not take place, if both VCC and VCCDR pins are not above their own turn-
on thresholds. During 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 0.6V (Typ.), the device enters in INHIBIT
mode: all the power mosfets are turned off and protections are disabled.
Setting the INH pin free, causes the device to restart.
VID
Reference
VOUT
t
1 Clock Cycle Blanking Time
25mV steps transition
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6919E | SWITCHING CONTROLLER, PDSO28 |
| L6920DTR | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920D | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6920 | 1.2 A SWITCHING REGULATOR, PDSO8 |
| L6924D013TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6919CDTR | 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 安裝風格: 封裝 / 箱體:CPAK |
| L6919E | 功能描述:DC/DC 開關(guān)控制器 5-Bit Dual Ph Contlr 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 安裝風格: 封裝 / 箱體:CPAK |
| L6919ETR | 功能描述:DC/DC 開關(guān)控制器 5-Bit Dual Ph Contlr 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 安裝風格: 封裝 / 箱體:CPAK |
| L-692 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:Common Mode Inductor |
| L6920 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
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