参数资料
型号: LT1737IS#TRPBF
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO CM 16SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 125kHz
占空比: 90%
电源电压: 4.1 V ~ 20 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
LT1737
TYPICAL APPLICATIO S
Overall power supply efficiency and output regulation
versus input voltage and load current may be seen in
Figures 9 and 10. Available output current is a function of
input voltage, varying from 650mA with 8V input to
1100mA with 25V input.
In cases when the output switching noise is objectionable,
the optional output L/C filter shown may be added. The
oscilloscope photos in Figure 11 show the dramatic reduc-
tion in output voltage ripple with the optional filter.
Note: It is theoretically possible to extend the input voltage
range of this topology higher by raising the breakdown
voltage ratings on Q1, U2 and M1, while adjusting the
transformer windings as necessary. However this ap-
proach is generally undesirable as the relatively fixed
90
80
70
V IN = 8V
60
supply current required by the LT1737 generates more
and more wasted heat in linear regulator U2 as input
voltage is increased. The LT1725, a close “cousin” of the
LT1737 is recommended in such instances.
The LT1725 is very similar to the LT1737, but it contains
an integral wide hysteresis undervoltage lockout (UVLO)
circuit that monitors the V CC voltage. When used in
conjunction with a 3-winding transformer to provide both
device power and output voltage feedback information,
this allows for a “trickle charge” start-up from an input
voltage of up to hundreds of volts. The LT1725 is thus well
suited to operate from “telecom” input voltages of 48V to
72V, or even offline inputs up to several hundred volts! See
the LT1725 data sheet for further information.
Without L/C Filter
50
40
30
20
0.01
0.1
V IN = 15V
V IN = 25V
1
50mV/DIV
AC COUPLED
I LOAD (A)
1737 F09
V IN = 15V 1 μ s/DIV
I LOAD = 900mA
20MHz BANDWIDTH LIMITED
1737 F11a
Figure 9. Efficiency vs I LOAD
5.25
5.00
V IN = 8V
V IN = 15V
V IN = 25V
50mV/DIV
AC COUPLED
With L/C Filter
4.75
0
250
500
750
1000
1250
V IN = 15V 1 μ s/DIV
1737 F11b
I LOAD (mA)
1737 F10
I LOAD = 900mA
20MHz BANDWIDTH LIMITED
Figure 10. Output Regulation
Figure 11
1737fa
22
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