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参数资料
| 型号： | MIC38C45YN |
| 厂商： | Micrel Inc |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK ISO 8-DIP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 50% |
| 电源电压： | 7.6 V ~ 20 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-2296 MIC38C45YN-ND |
MIC38C42/3/4/5
General Description
The MIC38C4x are ?xed frequency, high performance, cur-
rent-mode PWM controllers. Micrel’s BiCMOS devices are
pin compatible with 384x bipolar devices but feature several
improvements.
Undervoltage lockout circuitry allows the ’42 and ’44 versions
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
15V supply, start-up current has been reduced to 50μA typical
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 ef?ciency, espe-
cially at lower supply voltages. The MIC38C4x also features
a trimmed oscillator discharge current and bandgap refer-
ence.
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.
For fast rise and fall times and higher output drive, refer to
the MIC38HC4x.
Functional Diagram
Micrel, Inc.
MIC38C42/3/4/5
BiCMOS Current-Mode PWM Controllers
Features
? Fast 40ns output rise and 30ns output fall times
? –40°C to +85°C temperature range
meets UC284x speci?cations
? 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
? 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
? Synchronous FET converters
VDD
7 (12)
35V
*
VREF
8 (14)
5V
Reference
UVLO
?
(VD)
(11)
RT/CT
4 (7)
FB
2 (3)
2.5V
Oscillator
2R
R
T
S
R
Q
Q
?
OUT
6 (10)
(PGND)
(8)
*
COMP
1 (1)
GND* (AGND) ISNS
5 (9) 3 (5)
MIC38C4x, (8-lead) versions only
MIC38C42, MIC38C43 (96% max. duty cycle) versions only
MIC38C44, MIC38C45 (50% max. duty cycle) versions only
( ) pins are on MIC38C4x-1 (14-lead) 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
September 2007
1
M9999-091107
相关PDF资料 |
PDF描述 |
|---|---|
| MIC38C44AYM | IC REG CTRLR BST FLYBK ISO 8SOIC |
| MIC3838YMM | IC REG CTRLR ISO PWM 10-MSOP |
| MIC3839YMM | IC REG CTRLR ISO PWM 10-MSOP |
| MIC38C43AYM | IC REG CTRLR BST FLYBK ISO 8SOIC |
| MIC38C45AYM | IC REG CTRLR BST FLYBK ISO 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC-38-CABLE-MF-9 | 制造商:Emulation Technology Inc 功能描述:MICTOR 38 CABLE, MALE TO FEMALE, 9 INCHES LONG |
| MIC-38-CABLE-MM-6 | 制造商:Emulation Technology Inc 功能描述:38 PIN MICTOR CABLE, MALE TO MALE. 6 INCHES LONG |
| MIC38-CABLE-MM-9 | 制造商:Emulation Technology Inc 功能描述:RIBBON CABLE, MICTOR PLG 38WAY 0.229M BLK, No. of Conductors:38, Cable Length - Imperial:9", Cable Length - Metric:228.6mm, Connector Type A:MICTOR 38 Position Plug, Connector Type B:MICTOR 38 Position Plug, Jacket Color:Black , RoHS Compliant: No |
| MIC38HC42 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:BiCMOS 1A Current-Mode PWM Controllers |
| MIC38HC42_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:BiCMOS 1A Current-Mode PWM Controllers |
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