参数资料
型号: MIC2171WU TR
厂商: Micrel Inc
文件页数: 10/12页
文件大小: 0K
描述: IC REG MULTI CONFIG 2.5A TO263-5
标准包装: 1
类型: 降压(降压),升压(升压),反相,Cuk
输出数: 1
输入电压: 3 V ~ 40 V
PWM 型: 电流模式
频率 - 开关: 100kHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
包装: 标准包装
供应商设备封装: TO-263-5
产品目录页面: 1092 (CN2011-ZH PDF)
其它名称: 576-1541-6
Micrel, Inc.
time, using the off-time to reset the transformer core. In
the application shown, the transformer core is reset by
the tertiary winding discharging T1’s peak magnetizing
current through D2.
For most forward converters the duty cycle is limited to
50%, allowing the transformer flux to reset with only two
times the input voltage appearing across the power
switch. Although during normal operation this circuit’s
duty cycle is well below 50%, the MIC2172 has a
maximum duty cycle capability of 90%. If 90% was
required during operation (start-up and high load
currents), a complete reset of the transformer during the
MIC2171
off-time would require the voltage across the power
switch to be ten times the input voltage. This would limit
the input voltage to 6V or less for forward converter
applications.
To prevent core saturation, the application given here
uses a duty cycle limiter consisting of Q1, C4 and R3.
Whenever the MIC2171 exceeds a duty cycle of 50%,
T1’s reset winding current turns Q1 on. This action
reduces the duty cycle of the MIC2171 until T1 is able to
reset during each cycle.
V IN
12V
R1*
T1
1:1:1
C2*
D3
1N5819
L1 100μH
D4
1N5819
R4
C5 3.74k
470μF 1%
V OU T
5V, 1A
IN
SW
D1*
C1
22μF
MIC2171
FB
GND COMP
D2
1N5819
R2
1k
C3
1μF
Q1 ?
R 3 ?
C4 ?
R5
1.24k
1%
* Voltage clipper
? Duty cycle limiter
Figure 6. MIC2171 Forward Converter
May 2007
10
M9999-051107
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