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ADP1850 датащи(PDF) 24 Page - Analog Devices

номер детали ADP1850
подробное описание детали  Wide Range Input, Dual/Two-Phase, DC-to-DC Synchronous Buck Controller
PDF  32 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADP1850 датащи(HTML) 24 Page - Analog Devices

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ADP1850
Rev. 0 | Page 24 of 32
TIME
SLAVE VOLTAGE
MASTER VOLTAGE
Figure 40. Ratiometric Tracking (Slave Channel Has a Faster Ramp Rate)
ADP1850
EN2
EN1
EN
FB2
FB1
TRK1
SS1
VCCO
TRK2
SS2
10k
Ω
45.3k
Ω
RTRKB
10k
Ω
RTRKT
5k
Ω
2.2V
3.3V
VOUT1_MASTER
CSS2
20nF
CSS1
100nF
RBOT
10k
Ω
RTOP
20k
Ω
1.8V
VOUT2_SLAVE
Figure 41. Example of a Ratiometric Tracking Circuit (Slave Channel Has a
Faster Ramp Rate)
INDEPDENDENT POWER STAGE INPUT VOLTAGE
In addition to the single power supply configuration, the power
stage input voltage of the dc-to-dc converter can come from a
different voltage supply, as illustrated in Figure 42. The range of
the power stage input voltage (VPIN) is 1 V to 20 V. For instance,
the bias input voltage (VIN) is 5 V, VPIN can be as low as 1 V or as
high as 20 V. The user needs to make sure that the minimum
or the maximum duty cycle is not violated in this operating
condition. Furthermore, note that RRAMP is connected to VPIN.
VIN = 2.7V TO 20V
VIN
ADP1850
DH1
FB1
DL1
PGND1
SW1
VOUT1
VPIN = 1V TO 20V
RAMP1
RRAMP1
DH2
RAMP2
FB2
DL2
PGND2
SW2
VOUT2
VPIN = 1V TO 20V
RRAMP2
Figure 42. Independent Power Stage Input Voltage (Simplified Schematic)



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