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參數(shù)資料
| 型號： | PM6680ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, VFQFPN-32 |
| 文件頁數(shù)： | 35/48頁 |
| 文件大小： | 1932K |
| 代理商： | PM6680ATR |
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Design guidelines
PM6680A
40/48
Figure 40.
Bootstrap circuit
The bootstrap circuit capacitor value CBOOT must provide the total gate charge to the high
side MOSFET during turn on phase. A typical value is 100 nF.
The bootstrap diode D must charge the capacitor during the off time phases. The maximum
rated voltage must be higher than VINmax.
A resistor RBOOT on the BOOT pin could be added in order to reduce noise when the phase
node rises up, working like a gate resistor for the turn on phase of the high side MOSFET.
9.8
Design example
The following design example considers an input voltage from 16 V to 32 V(the typical value
is 24 V). The two switching outputs are OUT1 = 3.3 V and OUT2 = 1.8 V and must deliver a
maximum current of 2.5 A. The selected switching frequencies are about 290 kHz for OUT1
section and about 440 kHz for OUT2 section (see Table 6).
1.
Inductor selection
OUT1: ILOAD = 2.5 A, 45 % ripple current.
Equation 36
We choose standard value L= 8.2
H.
I
L(max) = 1.16 A @VIN = 24 V.
ILRMS = 2.523 A
Ipeak = 2.5 A + 0.58 A = 3.83 A
OUT2:ILOAD=2.5 A, 35 % ripple current.
P
PH
HA
AS
SE
E
C
CBBOOOOTT
R
RBBOOOOTT
L
LD
DO
O5
5
B
BO
OO
OT
T
D
L
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