- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄43901 > L6917BD (STMICROELECTRONICS) SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 PDF資料下載
參數(shù)資料
| 型號(hào)： | L6917BD |
| 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)： | 18/33頁 |
| 文件大?。?/td> | 631K |
| 代理商： | L6917BD |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當(dāng)前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
Obsolete
Product(s)
- Obsolete
Product(s)
25/33
L6917B
CPU Power Supply: 5 to 12VIN; 1.7VOUT; 45A
Considering the high slope for the load transient, a high switching frequency has to be used. In addition to fast
reaction, this helps in reducing output and input capacitor. Inductance value is also reduced.
A switching frequency of 200kHz for each phase is then considered allowing large bandwidth for the compen-
sation network. It can be considered to use the 5V rail for the power conversion in order to allow compatibility
with standard ATX power supply.
– Current Reading Network and Over Current:
Since the maximum output current is IMAX = 45A, the over current threshold has been set to 46A (23A
per phase) in the worst case (max mosfet temperature). This because the device limits the valley of the
triangular ripple across the inductors. Considering to sense the output current across the low-side mos-
fet RdsON, STB90NF03L has 6.5m
max at 25°C that becomes 9.1m considering the temperature
variation (+40%); the resulting Tran conductance resistor Rg has to be:
(R3 to R6)
– Droop function Design:
Considering a voltage drop of 100mv at full load, the feedback resistor RFB has to be:
(R7)
– Inductor design:
Each phase has to deliver up to 22.5A; considering a current ripple of 5A (<25%), the resulting induc-
tance value is:
(L1, L2)
– Output Capacitor:
Five Rubycon MBZ (2200
F / 6.3V / 12m max ESR) has been used implementing a resulting ESR of 2.4m
resulting in an ESR voltage drop of 45A*2.4m
= 108mV after a 45A load transient.
– Compensation Network:
A voltage loop bandwidth of 20kHz is considered to let the device fast react after load transient.
The RF CF network results:
(R8)
(C2)
Rg
I
MAX
2
-------------
RdsO N
35
---------------------
46
2
------
9.1m
35
-------------
5.9k
==
=
R
FB
100m V
70
A
-------------------
1.43k
==
L
Vi n
Vo ut
–
l
-----------------------------
d
Fsw
-----------
12
1.7
–
5
---------------------
1.7
12
--------
1
300000
--------------------
1
H
==
=
R
F
R
FB
V
OSC
V
IN
----------------------------------
5
4
---
ω
T
L
2R
DRO OP
ESR
+
()
-------------------------------------------------------
1.43k 2
12
----------------------
5
4
--- 20k 2
π
1
2
9.1m
5.9k
------------- 1.43k
2.4m
+
-------------------------------------------------------------------
6200
==
=
C
F
Co
L
2
---
R
F
--------------------
62200
1
2
-------
6.2k
-----------------------------------------
15 nF
==
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6917BDTR | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6917BDTR | 功能描述:DC/DC 開關(guān)控制器 Prog Dual-Phase Cont 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 |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。