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參數資料
| 型號： | PM6680TR |
| 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, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32 |
| 文件頁數： | 36/49頁 |
| 文件大?。?/td> | 2931K |
| 代理商： | PM6680TR |
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PM6680
Device description
41/49
Figure 39.
Inductor current waveforms
Typical components values are: R=47
and C = 1 uF.
●
VREF capacitor
A 10 nF to 100 nF ceramic capacitor on VREF pin must be added to ensure noise
rejection.
●
LDO5 output capacitors
Bypass the output of each linear regulator with 1 uF ceramic capacitor closer to the
LDO pin and a 4.7 uF tantalum capacitor (ESR = 2
). In most applicative conditions a
4.7 uF ceramic output capacitor can be enough to ensure stability.
●
Bootstrap circuit
The external bootstrap circuit is represented in the next figure:
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 100nF.
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.
V
VC
CC
C
R
C
L
LD
DO
O5
5
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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