参数资料
型号: LT3507EUHF#TRPBF
厂商: Linear Technology
文件页数: 18/28页
文件大小: 302K
描述: IC REG QD BUCK/LINEAR 38-QFN
产品培训模块: More Information on LDOs
标准包装: 2,500
拓扑: 降压(降压)(1),线性(LDO)(1)
功能: 任何功能
输出数: 4
频率 - 开关: 900kHz ~ 1.1MHz
电压/电流 - 输出 1: 0.8 V ~ 32.4 V,2.4A
电压/电流 - 输出 2: 0.8 V ~ 32.4 V,1.5A
电压/电流 - 输出 3: 0.8 V ~ 32.4 V,1.5A
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 4 V ~ 36 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
供应商设备封装: 38-QFN(5x7)
包装: 带卷 (TR)
LT3507
18
3507fa
APPLICATIONS INFORMATION
Figure 8. Two Different Modes of Output Voltage Tracking
Figure 9. Setup for Coincident and Ratiometric Tracking
Figure 10. Equivalent Input Circuit of Error Ampli er
if the master channel falls out of regulation (due to a short
circuit or a collapsing input voltage).
Finally, be aware that the circuit in Figure 7e does not 
work, because the power good comparators are disabled 
in shutdown.
OUTPUT VOLTAGE TRACKING
The LT3507 allows the user to program how the output
ramps up by means of the TRK/SS pins. Through these
pins, any channel output can be set up to either coinci-
dently or ratiometrically track any other channel output.
This example will show the channel 2 output tracking the
channel 1 output, as shown in Figure 8. The TRK/SS2 pin
acts as a clamp on channel 2s reference voltage. V
OUT2
 
is referenced to the TRK/SS2 voltage when the TRK/SS2
< 0.8V and to the internal precision reference when TRK/
SS2 > 0.8V.
To implement the coincident tracking in Figure 8a, connect
an extra resistive divider to the output of channel 1 and
connect its midpoint to the TRK/SS2 pin (Figure 9). The
ratio of this divider should be selected the same as that
of channel 2s feedback divider (R5 = R3 and R6 = R4). In
this tracking mode, V
OUT1
 must be set higher than V
OUT2
.
To implement the ratiometric tracking in Figure 8b, change
the extra divider ratio to R5 = R1 and R6 = R2 + 擱. The
extra resistance on R6 should be set so that the TRK/SS2
voltage is e1V when V
OUT1
 is at its  nal value.
The need for this extra resistance is best understood
with the help of the equivalent input circuit shown in
Figure 10. At the input stage of the error ampli er, two
common anode diodes are used to clamp the equivalent
reference voltage and an additional diode is used to match
the shifted common mode voltage. The top two current
sources are of the same amplitude. In the coincident mode,
 
R1
R2
=
V
OUT1
0.8
1,
R3
R4
=
V
OUT2
0.8
1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
R5   R1
R6   R2
V
OUT2
R4
R3
Tracking Setup
TO
V
FB1
PIN
TO
TRK/SS2
PIN
TO
V
FB2
PIN
V
OUT1
COINCIDENT
R3
R4
R5 =
R6 =
RATIOMETRIC
R1
R1
V
OUT1
/1V  1
SELECTING VALUES FOR R5 AND R6
TIME
(8a) Coincident Tracking
V
OUT1
V
OUT2
TIME
3507 F08
(8b) Ratiometric Tracking
V
OUT1
V
OUT2
1糀

+
I
I
D1
TRK/SS
0.8V
FB
D2
D3
3507 F10
EA2
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