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参数资料
| 型号： | L6918DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 25/35页 |
| 文件大小： | 431K |
| 代理商： | L6918DTR |
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L6918 L6918A
CPU Power Supply: 12VIN; 1.45VOUT; 110ADC
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 IMAX = 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 RdsON), 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:
– 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
H, the current ripple becomes:
– Output Capacitor:
Ten Rubycon MBZ (3300
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 RF CF 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
OC Px
R
dsON
35
------------------
22
4.5m
35
-------------
2.7k
(R3 to R6; R24 to R27)
==
=
R
FB
85mV
70
A
----------------
1.2k
(R7)
==
I
Vin
Vout
–
L
-----------------------------
d
Fsw
-----------
12
1.4
–
1
---------------------
1.4
12
--------
1
200k
-------------
6.2A
(L1, L2)
==
=
R
F
R
FB
V
OS
V
IN
------------------------------
5
4
---
ω
T
L
2R
DROOP
ESR
+
()
-------------------------------------------------------
1.2K 2
12
--------------------
5
4
--- 20k 2
Π
1
2
4.5m
2.7
------------- 1k
1.2m
+
----------------------------------------------------------
3.9k
==
=
C
F
Co
L
2
---
R
F
--------------------
6 3300
1
2
-------
3.9k
---------------------------------------- -
22nF
==
=
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