参数资料
型号: L6910ATR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装: EXPOSED PAD, HTSSOP-16
文件页数: 6/30页
文件大小: 763K
代理商: L6910ATR
L6910 - L6910A
14/29
Figure 16. Efficiency vs Output Current
6
COMPONENTS SELECTION
6.1 Inductor Selection
To select the right inductor value, the application conditions must be fixed. For example we can consider:
Vin=12V Vout =3.3V Iout=15A
Considering a ripple of approximately 25% to 30% of Iout, the inductor value will be L=3
H.
An iron powder core (TO50-52B) with 7 windings has been chosen.
6.2 Output Capacitors
2 POSCAP capacitors, model 6TPB330M, have been chosen, with a maximum ERS equal to 40m
each.
Therefore, the resultant ESR is of 20m
. Considering a current ripple of 4A, the output voltage ripple is:
Vout = 4 0.02 = 80mV
6.3 Input Capacitors
For IOUT = 15A and D = 0.5 (worst case for input current ripple), the RMS current of the input capacitor is equal
to 7.5A.
Two OSCON electrolytic capacitors 6SP680M, with a maximum ESR equal to 13m
, have been chosen to sus-
tain the ripple. Therefore, the resultant ESR is equal to 13m
/2 = 6.5m. The losses, in worst case, are:
P = ESR I2rms = 366mW
6.4 Over-Current Protection
The current limit can be set to approximately 20A. Substituting the demo board parameters in the relation-
ship reported in the relative section, (IOSCMIN =170
A; IP = 20A; RDSONMAX = 9m / 2=4.5m) it results
that ROCS = 510
Output Current (A)
Ef
ficien
cy
(
%
)
50
55
60
65
70
75
80
85
90
95
100
13
579
11
13
15
17
Vin=Vcc=12V
Fsw.=200KHZ
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=0.9V
Vin=Vcc=12V
Fsw.=200KHZ
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=0.9V
Vo=1.5V
Vo=2.5V
Vo=1.5V
Vo=2.5V
Output Current (A)
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