參數(shù)資料
型號(hào)： L6725TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： SOP-16
文件頁(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 812K
代理商： L6725TR
Device description
L6725 - L6725A
14/32
5.7
Driver section
The high-side and low-side drivers allow using different types of power MOSFETs (also multiple
MOSFETs to reduce the RDSON), maintaining fast switching transitions. The low-side driver is
supplied by VCCDR while the high-side driver is supplied by the BOOT pin. A predictive dead
time control avoids MOSFETs cross-conduction maintaining very short dead time duration in
the range of 20ns. The control monitors the phase node in order to sense the low-side body
diode recirculation. If the phase node voltage is less than a certain threshold (-350mV typ.)
during the dead time, it will be reduced in the next PWM cycle. The predictive dead time control
doesn’t work when the high-side body diode is conducting because the phase node doesn’t go
negative. This situation happens when the converter is sinking current for example and, in this
case, an adaptive dead time control operates.
5.8
Monitoring and protections
The output voltage is monitored by means of pin FB. The device provides over-voltage-
protection: when the voltage sensed on FB pin reaches a value 20% (typ.) greater than the
reference the low-side driver is turned on as long as the over voltage is detected (see Figure 8).
The device realizes the over-current-protection (OCP) sensing the current both on the high-side
MOSFET(s) and the low-side MOSFET(s) and so 2 current limit thresholds can be set (see
OCH pin and OCL pin in Table 4: Pin functions):
●
Peak Current Limit
●
Valley Current Limit
The Peak Current Protection is active when the high-side MOSFET(s) is turned on, after a
masking time of 100ns. The valley-current-protection is enabled when the low-side MOSFET(s)
is turned on after a masking time of 500ns. If, when the soft-start phase is completed, an over
current event occurs during the on time (peak-current-protection) or during the off time (valley-
current-protection) the device enters in HICCUP mode: the high-side and low-side MOSFET(s)
are turned off, the soft-start capacitor is discharged with a constant current
of 10A and when
the voltage at the SS pin reaches 0.5V the soft-start phase restarts (see Figure 9).
Figure 8.
OVP
LGate
FB
相關(guān)PDF資料
PDF描述
L6728ATR SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
L6728A SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10
L6728D 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10
L6911C 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
L6911DTR 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6726 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT
L6726_08 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT
L6726_12 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT
L6726A 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Sngl phase PWM controller 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
L6726A_07 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Single phase PWM controller
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