- 您现在的位置：买卖IC网 > PDF目录171440 > E-L6911ETR (STMICROELECTRONICS) 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 PDF资料下载
参数资料
| 型号： | E-L6911ETR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 4/35页 |
| 文件大小： | 563K |
| 代理商： | E-L6911ETR |
第1页第2页第3页当前第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
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.
相关PDF资料 |
PDF描述 |
|---|---|
| E-L6932D1.8 | 1.8 V FIXED POSITIVE LDO REGULATOR, PDSO8 |
| E-UC2842BN | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| E-UC2844BD1 | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| E-UC2845BD1013TR | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| E05-41M1 | 5 WATT WIDE INPUT DC TO DC CONVERTERS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL6915 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Laser Diode Driver w/ Waveform Generator |
| EL6915CL | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Laser Diode Driver w/ Waveform Generator |
| EL6915CL-T13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Laser Diode Driver w/ Waveform Generator |
| EL6915CL-T7 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Laser Diode Driver w/ Waveform Generator |
| EL6915CLZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Laser Diode Driver w/ Waveform Generator |
发布紧急采购，3分钟左右您将得到回复。