參數(shù)資料
型號(hào)： L6918ADTR
廠商： 意法半導(dǎo)體
英文描述： 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
中文描述： 5位可編程多相控制器
文件頁(yè)數(shù)： 31/35頁(yè)
文件大?。?/td> 760K
代理商： L6918ADTR
31/35
L6918 L6918A
CPU Power Supply: 12V
IN
; 1.45V
OUT
; 110A
DC
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. Considering the high output current, power conversion will start from the 12V bus.
– Current Reading Network and Over Current:
Since the maximum output current is I
MAX
= 110A, the over current threshold has been set to 110A
(27.5A x 4) in the worst case (max mosfet temperature). Since the device limits the valley of the trian-
gular ripple across the inductors, the current ripple must be considered too. Considering the inductor
core saturation, a current ripple of 10A has to be considered so that the OCP threshold in worst case
becomes OCPx = 22A (27.5A-5A). Considering to sense the output current across the low-side mosfets
RdsON (two in parallel to reduce equivalent R
dsON
), each STB90NF03L has 6.5m
max at 25°C that
becomes 9.1m
at 100°C considering the temperature variation; the resulting transconductance resis-
tor Rg has to be:
R
35
μ
35
μ
– Droop function Design:
Considering a voltage drop of 85mV at full load, the feedback resistor R
FB
has to be:
– Inductor design:
Transient response performance needs a compromise in the inductor choice value: the biggest the in-
ductor, the highest the efficient but the worse the transient response and vice versa. Considering then
an inductor value of 1
μ
H, the current ripple becomes:
Vin
Vout
–
L
Fsw
1
μ
– Output Capacitor:
Ten Rubycon MBZ (3300
μ
F / 6.3V / 12m
max ESR) has been used implementing a resulting ESR of
1.2m
resulting in an ESR voltage drop of 52A*1.2m
= 62mV after a 52A load transient.
– Compensation Network:
A voltage loop bandwidth of 20kHz is considered to let the device fast react after load transient.
The R
F
C
F
network results:
(R8)
(C2)
Further adjustments can be done on the work bench to fit the requirements and to compensate layout parasitic
components.
Rg
I
OCPx
-----------------
22
-------------
2.7k
(R3 to R6; R24 to R27)
=
=
=
R
FB
70
μ
A
----------------
1.2k
(R7)
=
=
I
----------------------------
-----------
--------–
1.4
12
-------
1
200k
------------
6.2A (L1, L2)
=
=
=
R
F
R
------------------------------
V
IN
5
4
--
ω
T
DROOP
)
-----------------------------------+
--------------------
5
4
--
20k 2
Π
2
-------------
1k
1.2m
+
----------------------------------------------------------
3.9k
=
=
=
C
F
Co
L
2
--
R
F
-------------------
6 3300
μ
----------------------------------------
μ
2
------
3.9k
22nF
=
=
=
相關(guān)PDF資料
PDF描述
L6918D 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER
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參數(shù)描述
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L6918DTR 功能描述:DC/DC 開(kāi)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(kāi)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
L6919 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919C 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
L6919CD 功能描述:DC/DC 開(kāi)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(kāi)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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