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參數(shù)資料
| 型號： | L6711 |
| 廠商： | 意法半導體 |
| 英文描述： | 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs |
| 中文描述： | 3相控制器，動態(tài)VID和可選數(shù)模轉換器 |
| 文件頁數(shù)： | 27/38頁 |
| 文件大?。?/td> | 591K |
| 代理商： | L6711 |
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L6711
mosfet of that phase until I
INFOx
re-cross the threshold or until the next clock cycle. This implies that the
device limits the peak of the inductor current.
In any case, the inductor current won't overcome the I
OCPx
value and this will represent the maximum peak
value to consider in the OC design.
The device works in Constant-Current, and the output voltage decreases as the load increase, until the
output voltage reaches the UVP threshold. When this threshold is crossed, all mosfets are turned off, the
FAULT pin is driven high and the device stops working. Cycle the power supply or the OUTEN pin to re-
start operation.
The transconductance resistor Rg can be designed considering that the device limits the inductor current
ripple peak. Moreover, when designing D-VID systems, the additional current due to the output filter
charge during dynamic VID transitions must be considered.
where
14 OSCILLATOR
The internal oscillator generates the triangular waveform for the PWM charging and discharging with a
constant current an internal capacitor. The switching frequency for each channel, F
SW
, is internally fixed
at 150kHz so that the resulting switching frequency at the load side results in being tripled.
The current delivered to the oscillator is typically 25
μ
A (corresponding to the free running frequency
Fsw=150kHz) and it may be varied using an external resistor (R
OSC
) connected between the OSC pin and
SGND or VCC (or a fixed voltage greater than 1.24V). Since the OSC pin is fixed at 1.24V, the frequency is
varied proportionally to the current sunk (forced) from (into) the pin considering the internal gain of 6KHz/
μ
A.
In particular connecting R
OSC
to SGND the frequency is increased (current is sunk from the pin), while
connecting R
OSC
to VCC=12V the frequency is reduced (current is forced into the pin), according to the
following relationships:
Maximum programmable switching frequency depends on the Current Reading Method selected. When
reading across LS mosfet, the maximum switching frequency per phase must be limited to 500kHz to
avoid current reading errors causing, as a consequence, current sharing errors. When reading across the
inductor, higher switching frequency can be approached (device power dissipation must be checked prior
to design high switching frequency systems).
Figure 20. R
OSC
vs. Switching Frequency
Rg
I
-----------------------------------------------------------------------
R
I
OCTH min
)
)
=
I
OCPx
I
3
)
---------------------------
I
2
-----------
I
3
---------------
+
+
=
R
OSC
vs. GND: F
SW
150kHz
R
OSC
k
(
)
----------------------------
6kHz
μ
A
+
150kHz
6
R
OSC
k
(
)
----------------------------
+
=
=
R
OSC
vs. 12V: F
SW
150kHz
R
OSC
k
(
)
----------------------------
6kHz
μ
A
+
150kHz
7
R
OSC
k
(
)
----------------------------
+
=
=
0
2000
4000
6000
8000
10000
12000
14000
25
50
75
100
125
150
0
200
400
600
800
1000
150
250
350
450
550
650
750
850
R
OSC
[k
] to 12V vs. Selected F
SW
[kHz]
R
OSC
[k
] to SGND vs. Selected F
SW
[kHz]
相關PDF資料 |
PDF描述 |
|---|---|
| L6711TR | 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs |
| L6714 | 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs |
| L6714TR | 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs |
| L6726A | Single phase PWM controller |
| L6726ATR | Single phase PWM controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6711_06 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3 Phase controller with dynamic VID and selectable DACs |
| L6711TR | 功能描述:DC/DC 開關控制器 3 PHASE CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 |
| L6712 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
| L6712A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TWO-PHASE INTERLEAVED DC/DC CONTROLLER |
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