PM6681A STMicroelectronics, PM6681A Datasheet - Page 41
PM6681A
Manufacturer Part Number
PM6681A
Description
Dual synchronous step down controller with adjustable LDO
Manufacturer
STMicroelectronics
Datasheet
1.PM6681A.pdf
(47 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PM6681ATR
Manufacturer:
STM
Quantity:
6 000
PM6681A
9.8.5
9.8.6
9.8.7
9.8.8
(Let's assume T
Input capacitor
Maximum input capacitor RMS current is about 1.1 A. Then I
We can put two 10 µF ceramic capacitors with I
Synchronous rectifier
OUT1: Schottky diode STPS1L40M
OUT2: Schottky diode STPS1L40M
Integrator loop
(Refer to
OUT1: The ripple is smaller than 40mV, then the virtual ESR network is required.
C
C = 5.6 nF; R = 36 kΩ; R1 = 3 kΩ
OUT2: The ripple is smaller than 40mV, then the virtual ESR network is required.
C
C = 5.6 nF; R = 22 kΩ; R1 = 3.3 kΩ
Output feedback divider
(Refer to
OUT1: R1 = 10 kΩ; R2 = 6.8 kΩ
OUT2: R1 = 11 kΩ; R2 = 1.8 kΩ
INT
INT
= 1 nF; C
= 1 nF; C
Figure 40
Figure 32
filt
filt
max
= 47 pF; R
= 110 pF; R
)
)
= 75 °C in R
R
INT
INT
CSENSE
= 1 kΩ
DS(on)
= 1 kΩ
≡
100
calculation)
4
2 .
µ
A
A
⋅
16
rms
.
25
= 1.5 A.
m
Ω
≈
680
CinRMS
Ω
> 1.1 A
Design guidelines
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