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參數(shù)資料
| 型號： | L6911ETR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 4/34頁 |
| 文件大?。?/td> | 558K |
| 代理商： | L6911ETR |
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Device description
L6911E
12/34
5.2
Digital to analog converter
The built-in digital to analog converter allows the adjustment of the output voltage from
1.050V to 1.825V with 25mV binary steps as shown in the previous Table 6: VID Setting on
page 9. The internal reference is trimmed to ensure the precision of 1%.
The internal reference voltage for the regulation is programmed by the voltage identification
(VID) pins. These are TTL compatible inputs of an internal DAC that is realised by means of
a series of resistors rpoviding 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); 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.
5.3
Soft start and inhibit
At start-up a ramp is generated charging the external capacitor CSS by means of a 10A
constant current, as shown in Figure 4 on page 13
When the voltage across the soft start capacitor (VSS) reaches 0.5V the lower power MOS is
turned on to discharge the output capacitor. As VSS reaches 1V (i.e. the oscillator triangular
wave inferior limit) also the upper MOS begins to switch and the output voltage starts to
increase.
The VSS growing voltage initially clamps the output of the error amplifier, and consequently
VOUT linearly increases, as shown in Figure 4 on page 13. In this phase the system works
in open loop. When VSS is equal to VCOMP the clamp on the output of the error amplifier is
released. In any case another clamp on the non-inverting input of the error amplifier remains
active, allowing to VOUT to grow with a lower slope (i.e. the slope of the VSS voltage, see
Figure 4 on page 13). In this second phase the system works in closed loop with a growing
reference. As the output voltage reaches the desired value VPROG, also the clamp on the
error amplifier input is removed, and the soft start finishes. Vss increases until a maximum
value of about 4V.
The Soft-Start will not take place, and the relative pin is internally shorted to GND, if both
VCC and OCSET pins are not above their own Turn-On thresholds; in this way the device
starts switching only if both the power supplies are present. During normal operation, if any
under-voltage is detected on one of the two supplies, the SS pin is internally shorted to GND
and so the SS capacitor is rapidly discharged.
The device goes in INHIBIT state forcing SS pin below 0.4V. In this condition both external
MOSFETS are kept OFF.
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| L6912-2 | 制造商:Thomas & Betts 功能描述:1/2 CORD GRIP CONNECTOR,2/BG |
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| L6916D | 功能描述:運算放大器 - 運放 POWER SUPPLY RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| L6916DTR | 功能描述:運算放大器 - 運放 POWER SUPPLY RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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