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| 型号： | ADP1850DP-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP1850DP |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.09V |
| 电流 - 输出： | 50A |
| 输入电压： | 10 ~ 15 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1850DP |
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Data Sheet
ADP1850
? 1 + TOP ?
R BOT ? ?
= ?
? 1 + TRKT ?
R TRKB ? ?
?
VOLTAGE TRACKING
The ADP1850 includes a tracking feature that tracks a master
voltage. This feature is especially important when the ADP1850
is providing separate power supply voltages to a single integrated
circuit, such as the core and I/O voltages of a DSP, FPGA, or
V OUT _ SLAVE
V OUT _ MASTER
? R ?
?
? R ?
?
microcontroller. In these cases, improper sequencing can cause
damage to the load IC.
In all tracking configurations, the output can be set as low as 0.6 V
for a given operating condition. The soft start time setting of
the master voltage should be longer than the soft start of the
slave voltage. This forces the rise time of the master voltage to
be imposed on the slave voltage. If the soft start setting of the
slave voltage is longer, the slave comes up more slowly, and the
tracking relationship is not seen at the output.
coincident and ratiometric trackings.
Coincident Tracking
The most common application is coincident tracking, used in
core vs. I/O voltage sequencing and similar applications.
Coincident tracking forces the slave output voltage’s ramp rate
to be the same as the master’s until the slave output reaches its
regulation. Connect the slave TRKx input to a resistor divider
from the master voltage that is the same as the divider used on
the slave FBx pin. This forces the slave voltage to be the same as
the master voltage. For coincident tracking, use R TRKT = R TOP
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 reference voltage
(V FB , typically 0.6 V), make sure that the final value of the TRKx
voltage of the slave channel is at least 30 mV above V FB .
Ratiometric Tracking
Ratiometric tracking limits the output voltage to a fraction of
the master voltage, as illustrated in Figure 38 and Figure 39. The
final TRKx voltage of the slave channel should be set to at least
30 mV below the FB voltage of the master channel. When the
TRKx voltage of the slave channel drops to a level that’s below
the minimum on-time condition, the slave channel operates in
pulse skip mode while keeping the output regulated and tracked
to the master channel. Also, when TRKx or FBx drops below
the PGOOD undervoltage threshold, the PGOOD signal gets
tripped and becomes active low.
MASTER VOLTAGE
MASTER VOLTAGE
SLAVE VOLTAGE
SLAVE VOLTAGE
TIME
TIME
Figure 38. Ratiometric Tracking
R TRKT
ADP1850
R TRKB
10k ?
C SS2
V OUT1_MASTER
R TRKT
ADP1850
49.9k ?
0.6V
0.55V
TRK1
FB1
C SS1
C SS2
EN
VCCO
C SS1
100nF
Figure 36. Coincident Tracking
3.3V
V OUT1_MASTER
EN1 EN2
45.3k ? 20k ?
1.1V
TRK1 FB1
10k ?
SS1 TRK2
SS2
FB2 20nF
R BOT R TOP
10k ? 20k ?
1.8V
V OUT2_SLAVE
3.3V
EN
EN1 EN2
45.3k ?
VCCO
10k ? R TRKB
10k ?
SS1 TRK2
37nF
SS2
FB2 20nF
R BOT R TOP
10k ? 22.6k ?
0.55V 1.8V
V OUT2_SLAVE
Figure 39. Example of a Ratiometric Tracking Circuit
Figure 37. Example of a Coincident Tracking Circuit
The ratio of the slave output voltage to the master voltage is a
function of the two dividers.
Rev. A | Page 23 of 32
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