參數(shù)資料
型號(hào)： L6919CDTR
廠商： 意法半導(dǎo)體
英文描述： CAP 20PF 50V 5% C0G SMD-0805 TR-7-PL SN100
中文描述： 5位可編程雙相與動(dòng)態(tài)VID管理控制器
文件頁(yè)數(shù)： 26/32頁(yè)
文件大?。?/td> 558K
代理商： L6919CDTR
L6919C
26/32
CPU Power Supply: 5 to 12V
IN
; 1.2V
OUT
; 45A
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
= 45A, the over current threshold has been set to 45A (22.5A
x 2)in the worst case (max mosfet temperature). Since the device limits the valley of the triangular ripple
across the inductors, the current ripple must be considered too. Considering the inductor core satura-
tion, a current ripple of 10A has to be considered so that the OCP threshold in worst case becomes
OCPx=17A (22.5A-5A). Considering to sense the output current across the low-side mosfet RdsON,
SUB85N03L-04P has 4.3m
max at 25°C that becomes 5.6m
at 100oC considering the temperature
variation; the resulting transconductance resistor Rg has to be:
R
35
μ
– Droop function Design:
Considering a voltage drop of 70mV 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 0.8
μ
H, the current ripple becomes:
– Output Capacitor:
Five Rubycon MBZ (2200
μ
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 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
-----------------
17
35
μ
-------------
2.7k
(R3 to R6)
=
=
=
R
FB
70
μ
A
----------------
1k
(R7)
=
=
I
Vin
-----------–
Vout
L
d
Fsw
-----------
12
--------------------
1.2
–
0.8
μ
1.2
12
-------
1
200k
------------
6.5A (L1, L2)
=
=
=
R
F
R
------------------------------
V
IN
5
4
--
ω
T
DROOP
+
)
-------------------------------------------------------
---------------
5
4
--
20K 2
Π
2
-------------
1.2k
2.4m
+
---------------------------------------------------------------
2.0k
=
=
=
C
F
Co
L
2
--
R
F
-------------------
6 2200
μ
----------------------------------------
μ
------
2k
33nF
=
=
=
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參數(shù)描述
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L6919ETR 功能描述:DC/DC 開(kāi)關(guān)控制器 5-Bit Dual Ph Contlr 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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L6920 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER
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