参数资料
型号: LT1578IS8#TR
厂商: Linear Technology
文件页数: 26/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8SOIC
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.21V
输入电压: 4 V ~ 15 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-SOIC
LT1578/LT1578-2.5
APPLICATIO N S I N FOR M ATIO N
( V IN OUT ) + ( V IN )( V OUT )
2 ( L )( f ) ( V IN OUT )
+ V
Ripple Current in the Input and Output Capacitors
Positive-to-negative converters have high ripple current in
both the input and output capacitors. For long capacitor
lifetime, the RMS value of this current must be less than
the high frequency ripple current rating of the capacitor.
The following formula will give an approximate value for
RMS ripple current. This formula assumes continuous
conduction mode and a large inductor value. Small induc-
tors will give somewhat higher ripple current, especially in
discontinuous mode. The exact formulas are very com-
Diode Current
Average diode current is equal to load current. Peak diode
current will be considerably higher.
Peak diode current:
Continuous Mode =
+ V
I OUT
V IN
( )( ) f
plexandappearinApplicationNote44,pages30and31.
For our purposes here, a simple fudge factor (ff) is added.
The value for ff is about 1.2 for load currents above 0.38A
(in continuous conduction mode) and L ≥ 10 μ H. It in-
creases to about 2.0 for smaller inductors at lower load
Discontinuous Mode =
2 ( I OUT )( V OUT )
L
currents (in discontinuous conduction mode).
Keep in mind that during start-up and output overloads,
Capacitor I RMS = ( ff )( I OUT )
ff = Fudge factor (1.2 to 2.0)
26
V OUT
V IN
the average diode current may be much higher than with
normal loads. Care should be used if diodes rated less than
1A are used, especially if continuous overload conditions
must be tolerated.
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