参数资料
型号: ADP1877HC-EVALZ
厂商: Analog Devices Inc
文件页数: 24/32页
文件大小: 0K
描述: BOARD EVALUATION 13A ADP1877
标准包装: 1
主要目的: DC/DC,步降
输出及类型: 2,非隔离
输出电压: 1.05V,1.8V
电流 - 输出: 13A
输入电压: 6 ~ 14 V
稳压器拓扑结构: 降压
频率 - 开关: 600kHz
板类型: 完全填充
已供物品:
已用 IC / 零件: ADP1877
ADP1877
The ratio of the slave output voltage to the master voltage is a
function of the two dividers.
Data Sheet
RATIOMETRIC TRACKING
Ratiometric tracking limits the output voltage to a fraction of
? ? 1 +
?
R BOT ? ?
? ? 1 + TRKT ? ?
V OUT _ SLAVE
V OUT _ MASTER
? R TOP ?
= ?
? R ?
? R TRKB ?
the master voltage. For ratiometric tracking, the simplest
configuration is to tie the TRK pin of the slave channel to the
FBx pin of the master channel. However, because of the large
internal offset between TRKx and FBx, this ratiometric tracking
configuration is not recommended. A tracking configuration
As the master voltage rises, the slave voltage rises identically.
Eventually, the slave voltage reaches its regulation voltage,
where the internal reference takes over the regulation while the
TRKx input continues to increase and thus removes itself from
influencing the output voltage.
To ensure that the output voltage accuracy is not compromised
by the TRKx pin being too close in voltage to the 0.6 V
reference, make sure that the final value of the TRKx voltage of
that requires the TRKx voltage of the slave channel below 0.6 V
is not recommended because of the large internal TRKx to FBx
offset voltage.
Another ratiometric tracking configuration is having the slave
channel rise more quickly than the master channel, as shown in
Figure 38 and Figure 39. The tracking circuits in Figure 37 and
Figure 38 are virtually identical with the exception that RTRKB
> RTRKT, as shown in Figure 38.
the slave channel is at least 0.7 V.
EN
3.3V
V OUT1_MASTER
VCCO
1 M ?
EN1
TRK1
EN2
FB1
45.3k ?
10k ?
R TRKT
5k ?
2.2V
R TRKB
10k ?
ADP1877
C SS1
100nF
SS1
R BOT
10k ?
FB2
TRK2
SS2
R TOP
20k ?
C SS2
20nF
1.8V
V OUT2_SLAVE
Figure 38. A Simple Ratiometric Tracking Circuit (Slave Channel Has
a Faster Ramp Rate)
MASTER VOLTAGE
SLAVE VOLTAGE
TIME
Figure 39. Ratiometric Tracking (Slave Channel Has a Faster Ramp Rate)
Rev. D | Page 24 of 32
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