參數(shù)資料
型號(hào)： E-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： ROHS COMPLIANT, SO-28
文件頁(yè)數(shù)： 18/33頁(yè)
文件大小： 465K
代理商： E-L6917BD
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
MA X
2
-------------
RdsO N
35
---------------------
46
2
------
9.1m
35
-------------
5.9k
==
=
R
FB
100mV
70
A
-------------------
1.43k
==
L
Vi n
Vout
–
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
DROOP
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
-----------------------------------------
15nF
==
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
E-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
E-L6919E 功能描述:電流型 PWM 控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
E-L6919ETR 功能描述:電流型 PWM 控制器 5-Bit Dual Ph Contlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
E-L6920D 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
E-L6920DTR 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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