參數(shù)資料
型號(hào)： L6711TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
封裝： 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁(yè)數(shù)： 32/50頁(yè)
文件大?。?/td> 679K
代理商： L6711TR
Obsolete
Product(s)
- Obsolete
Product(s)
Oscillator
L6711
38/50
15
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, FSW, 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
A (corresponding to the free running
frequency Fsw=150kHz) and it may be varied using an external resistor (ROSC) 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/
A.
In particular connecting ROSC to SGND the frequency is increased (current is sunk from the
pin), while connecting ROSC 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 19.
ROSC vs. switching frequency
R
OSC vs. GND: FSW
150kHz
1.237
R
OSC k
()
---------------------------- 6
kHz
A
-----------
+
150kHz
7.422 10
6
R
OSC k
()
-----------------------------
+
==
R
OSC vs. 12V: FSW
150kHz
12-1.237
R
OSC k
()
---------------------------- 6
kHz
A
-----------
+
150kHz
6.457 10
7
R
OSC k
()
-----------------------------
+
==
0
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25
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75
100
125
150
0
200
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800
1000
150
250
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450
550
650
750
850
ROSC [k] to SGND vs. Selected FSW [kHz]
ROSC [k] to 12V vs. Selected FSW [kHz]
相關(guān)PDF資料
PDF描述
L6711 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48
L6714TR SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
L6714 SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64
L6725TR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6728ATR SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
L6712AD 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6712ADTR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2-Ph Interleaved RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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