參數(shù)資料
型號(hào)： L6917BDTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28
封裝： SO-28
文件頁數(shù)： 4/33頁
文件大?。?/td> 631K
代理商： L6917BDTR
Obsolete
Product(s)
- Obsolete
Product(s)
L6917B
12/33
current (IINFOx>35A): the device enters in Quasi-Constant-Current operation. The low-side mosfets stays ON
until IINFO becomes lower than 35A skipping clock cycles. The high side mosfets can be turned ON with a TON
imposed by the control loop at the next available clock cycle and the device works in the usual way until another
OCP event is detected.
The device limits the bottom of the inductor current triangular waveform. So the average current delivered can
slightly increase also in Over Current condition since the current ripple increases. In fact, the ON time increases
due to the OFF time rise because of the current has to reach the 140% bottom. The worst-case condition is
when the duty cycle reaches its maximum value (d=75% internally limited). When this happens, the device
works in Constant Current and the output voltage decrease as the load increase. Crossing the UVP threshold
causes the device to latch (FAULT pin is driven high).
Figure 5 shows this working condition
Figure 5. Constant Current operation
It can be observed that the peak current (Ipeak) is greater than the 140% but it can be determined as follow:
Where INOM is the nominal current and VoutMIN is the minimum output voltage (VID-40% as explained below).
The device works in Constant-Current, and the output voltage decreases as the load increase, until the output
voltage reaches the under-voltage threshold (VoutMIN). 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 to restart operation.
The maximum average current during the Constant-Current behavior results:
In this particular situation, the switching frequency results reduced. The ON time is the maximum allowed (Ton-
MAX) while the OFF time depends on the application:
Over current is set anyway when IINFOx reaches 35A. The full load value is only a convention to work with con-
venient values for IFB. Since the OCP intervention threshold is fixed, to modify the percentage with respect to
the load value, it can be simply considered that, for example, to have on OCP threshold of 170%, this will cor-
respond to IINFOx = 35A (IFB = 70A). The full load current will then correspond to IINFOx = 20.5A (IFB = 41A).
TonMAX
140%
Ipeak
IMAX
Vout
Iout
Inom
IOCP
IMAX
UVP
Droop
effect
Ipea k
1.4 I
NOM
V
IN
Vout
MIN
–
L
--------------------------------------- To n
MAX
+
=
I
MAX
1.4 I
NOM
2
Ip eak
1.4 I
NOM
–
2
-------------------------------------------------
+
=
T
OFF
L
Ipe ak
1.4 I
NOM
–
Vout
-------------------------------------------------
=
f
1
To n
MAX
T
OFF
+
-------------------------------------------
=
相關(guān)PDF資料
PDF描述
L6917D SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28
L6918ADTR SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28
L6918AD SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28
L6919CD SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28
L6919E SWITCHING CONTROLLER, PDSO28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6917D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
L6917DTR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
L6918 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918A 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
L6918AD 功能描述:DC/DC 開關(guān)控制器 Prog Multi-Phase Cnt RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK
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