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| 型號： | ADP1875ARQZ-0.3-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 19/44頁 |
| 文件大小： | 2475K |
| 代理商： | ADP1875ARQZ-0.3-R7 |
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ADP1874/ADP1875
Rev. 0 | Page 26 of 44
The slave output tracks the master output dv/dt until the slave
output regulation point is reached. Any influence by the master
voltage thereafter will no longer be in effect. Ensure that the voltage
forced on the slave TRACK pin is above 0.7 V at the end of TRACK
phase. Voltages imposed on the TRACK pin below 0.7 V, once
that tracking period has expired (steady state), may result in
regulation inaccuracies due to the internal offsets of the error
amplifier between TRACK and FB. Ratiometric tracking can be
achieved by assigning the slave output to rise more quickly than
the master voltage. The simplest way to perform ratiometric
tracking is to differentially connect the slave TRACK pin to the
FB pin of the master voltage IC. The slave output, however, must
be limited to a fraction of the master voltage. In this tracking
configuration, it is not recommended for the slave TRACK pin
to terminate at a voltage lower than 0.6 V due to inaccuracies
between the TRACK and FB inputs previously mentioned. It is
not recommended to force any voltage on the slave TRACK pin
lower than 0.6 V. Figure 84 illustrates a circuit with a ratiometric
tracking configuration. Setting RTRK1 > RTRK2 ensures that the
slave TRACK voltage will rise up more quickly (to the regulation
point) than the master voltage.
0
93
47
-08
5
MASTER VOLTAGE
SLAVE VOLTAGE
TIME (ms)
OU
TP
U
T
V
O
LT
A
G
E
(V
)
Figure 84. Ratiometric Tracking: Master Voltage—Slave Voltage Tracking
Relationship
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