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MIC38C45YM PDF预览

MIC38C45YM

更新时间: 2024-01-26 01:10:33
品牌 Logo 应用领域
麦瑞 - MICREL 开关光电二极管信息通信管理控制器
页数 文件大小 规格书
11页 346K
描述
BiCMOS Current-Mode PWM Controllers

MIC38C45YM 技术参数

是否无铅: 含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:DIP
包装说明:LEAD FREE, PLASTIC, DIP-8针数:8
Reach Compliance Code:unknown风险等级:5.59
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:30 V
最小输入电压:8.2 V标称输入电压:15 V
JESD-30 代码:R-PDIP-T8JESD-609代码:e3
长度:9.525 mm湿度敏感等级:NOT SPECIFIED
功能数量:1端子数量:8
最高工作温度:85 °C最低工作温度:-40 °C
最大输出电流:0.5 A封装主体材料:PLASTIC/EPOXY
封装代码:DIP封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):260
表面贴装:NO切换器配置:BOOST
最大切换频率:500 kHz技术:BICMOS
温度等级:INDUSTRIAL端子面层:MATTE TIN
端子形式:THROUGH-HOLE端子节距:2.54 mm
端子位置:DUAL处于峰值回流温度下的最长时间:40
宽度:7.62 mmBase Number Matches:1

MIC38C45YM 数据手册

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MIC38C42/3/4/5  
BiCMOS Current-Mode PWM Controllers  
General Description  
Features  
The MIC38C4x are fixed frequency, high performance, cur-  
rent-mode PWM controllers. Micrel’s BiCMOS devices are  
pin compatible with 384x bipolar devices but feature several  
improvements.  
• Fast 40ns output rise and 30ns output fall times  
• –40°C to +85°C temperature range  
meets UC284x specifications  
• High-performance, low-power BiCMOS Process  
• Ultralow start-up current (50µA typical)  
• Low operating current (4mA typical)  
• CMOS outputs with rail-to-rail swing  
• ≥ 500kHz current-mode operation  
• Trimmed 5V bandgap reference  
Undervoltagelockoutcircuitryallowsthe42and44versions  
to start up at 14.5V and operate down to 9V, and the ’43 and  
’45 versions start at 8.4V with operation down to 7.6V. All  
versions operate up to 20V.  
When compared to bipolar 384x devices operating from a  
15Vsupply,start-upcurrenthasbeenreducedto50µAtypical  
and operating current has been reduced to 4.0 mA typical.  
Decreased output rise and fall times drive larger MOSFETs,  
and rail-to-rail output capability increases efficiency, espe-  
cially at lower supply voltages. The MIC38C4x also features  
a trimmed oscillator discharge current and bandgap refer-  
ence.  
• Pin-for-pin compatible with UC3842/3843/3844/3845(A)  
• Trimmed oscillator discharge current  
• UVLO with hysteresis  
• Low cross-conduction currents  
Applications  
• Current-mode, off-line, switched-mode power supplies  
• Current-mode, dc-to-dc converters.  
• Step-down “buck” regulators  
• Step-up “boost” regulators  
• Flyback, isolated regulators  
• Forward converters  
The MIC38C4x denotes 8-pin plastic DIP, SOIC, and MSOP  
packages. MIC384Cx-1 denotes 14-pin plastic DIP and  
SOIC packages. 8-pin devices feature small size, while 14-  
pin devices separate the analog and power connections for  
improved perfomance and power dissipation.  
• Synchronous FET converters  
For fast rise and fall times and higher output drive, refer to  
the MIC38HC4x.  
Functional Diagram  
*
VDD  
7 (12)  
35V  
5V  
Reference  
(VD)  
UVLO  
VREF  
(11)  
8 (14)  
Oscillator  
RT/CT  
OUT  
4 (7)  
6 (10)  
T
Q
Q
FB  
2R  
R
2 (3)  
(PGND)  
(8)  
S
R
2.5V  
*
COMP GND* (AGND) ISNS  
1 (1)  
5
(9)  
3 (5)  
( ) pins are on MIC38C4x-1 (14-lead) versions only  
*
MIC38C4x, (8-lead) versions only  
MIC38C42, MIC38C43 (96% max. duty cycle) versions only  
MIC38C44, MIC38C45 (50% max. duty cycle) versions only  
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-091107  
September 2007  
1

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