參數(shù)資料
型號： L5988D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁數(shù)： 9/52頁
文件大?。?/td> 1858K
代理商： L5988D
L5988D
Functional description
Doc ID 15324 Rev 3
17/52
Beating frequency noise is an issue when more than one voltage rail is on the same board.
A simple way to avoid this problem is to operate all the regulators at the same switching
frequency. The synchronization feature of a set of L5988D is simply get connecting together
their SYNCH pin. The device with highest switching frequency will be the MASTER and
provides the synchronization signal to the others. Therefore the SYNCH is a I/O pin to
deliver or recognize a frequency signal.
In order to minimize the RMS current flowing through the input filter, the L5988D provides a
phase shift of 180° between the master and the SLAVES. In cases where more than two
devices are synchronized, all slaves will have a common 180° phase shift with respect to the
master.
In case the synchronized set shares a switching frequency different to the nominal 400 kHz,
it is suggested to provide the proper FSW resistor to each device. In this way all the devices
will have a common peak amplitude of the internal sawtooth signal so the same oscillator
gain in the open loop gain transfer function. In this way the same compensation network is
valid for all the devices.
Taking in account the case of two synchronized L5988D regulating the same output voltage,
the RMS current in the input filter will be optimized and will observe the following formula:
Multiple regulators can be also synchronized to an external frequency signal fed to the
SYNCH pin. In this case the set is phased to the reference and all the devices will work with
0° phase shift.
The graphical representation of the input RMS current of the input filter in the case of two
devices with 0° phase shift (synchronized to an external signal) or 180° phase shift
(synchronized connecting their SYNCH pins) regulating the same output voltage is provided
in Figure 8. To dimension the proper input capacitor please refer to Chapter 6.1
Figure 8.
Input RMS current of two synchronized regulators
I
RMS
I
OUT
2
------------
2D
1
2D
–
()
if D < 0.5
I
OUT
2
------------
2D
1
–
() 22D
–
()
if D > 0.5
=
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L5988DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989D 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5989DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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L5991_01 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY
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