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MIC38C43A の電気的特性と機能

MIC38C43AのメーカーはMicrel Semiconductorです、この部品の機能は「BiCMOS Current-Mode PWM Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 MIC38C43A
部品説明 BiCMOS Current-Mode PWM Controllers
メーカ Micrel Semiconductor
ロゴ Micrel Semiconductor ロゴ 




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MIC38C43A Datasheet, MIC38C43A PDF,ピン配置, 機能
MIC38C42A/43A/44A/45A
Micrel, Inc.
MIC38C42A/43A/44A/45A
BiCMOS Current-Mode PWM Controllers
General Description
Features
The MIC38C4xA are fixed frequency, high performance,
• Fast 40ns output rise and 30ns output fall times
current-mode PWM controllers. Micrel’s BiCMOS devices
• –40°C to +85°C temperature range
are pin compatible with 384x bipolar devices but feature
meets UC284x specifications
several improvements.
• High-performance, low-power BiCMOS Process
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 50 µA
typical and operating current has been reduced to 4.0mA
typical. Decreased output rise and fall times drive larger
MOSFETs, and rail-to-rail output capability increases effi-
ciency, especially at lower supply voltages. The MIC38C4xA
• Ultralow start-up current (100µA 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
• Trimmed oscillator discharge current
• UVLO with hysteresis
• Low cross-conduction currents
Applications
also features a trimmed oscillator discharge current and
bandgap reference.
• Current-mode, off-line, switched-mode power supplies
• Current-mode, dc-to-dc converters.
The MIC38C4xA family is available in 8-pin SOIC and MSOP- • Step-down “buck” regulators
8 (MM8) package options
• Step-up “boost” regulators
• Flyback, isolated regulators
For fast rise and fall times and higher output drive, refer to the
MIC38HC4x.
• Forward converters
• Synchronous FET converters
Functional Diagram
VDD
7
VREF
8
RT/CT
4
FB
2
2.5V
5V
Reference
Oscillator
2R
R
UVLO
TQ
S
R
Q
OUT
6
COMP
1
GND ISNS
53
MIC38C42A, MIC38C43A (96% max. duty cycle) versions only
MIC38C44A, MIC38C45A (50% max. duty cycle) versions only
MM8 is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
http://www.Datasheet4U.com
April 2005
1 M9999-042205

1 Page





MIC38C43A pdf, ピン配列
MIC38C42A/43A/44A/45A
Pin Configuration
MIC38C4xA
COMP 1
8 VREF
FB 2
7 VDD
ISNS 3
6 OUT
RT/CT 4
5 GND
8-Lead SOIC (M)
8-Lead MM8™ (MM)
Micrel, Inc.
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
COMP
FB
ISNS
RT/CT
GND
OUT
VDD
VREF
Pin Function
Compensation: Connect external compensation network to modify the error
amplifier output.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
Ground: Combined analog and power ground.
Power Output: Totem-pole output.
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
5V Reference (Output): Connect external RC network.
April 2005
3 M9999-042205


3Pages


MIC38C43A 電子部品, 半導体
MIC38C42A/43A/44A/45A
Typical Characteristics
Oscillator Frequency
Configuration
100
200pF
470pF
1nF
10
1.8nF
4.7nF
10nF
VDD = 15V
1
1x104
1x105
5x105
OSCILLATOR FREQUENCY (Hz)
Current Sense Amplifier
vs. Error Amplifier Output
1.2
1.0
125°C
0.8
0.6
25°C
0.4
-50°C
0.2
0.0
02
468
ERROR AMPLIFIER OUTPUT (V)
MIC38C42/43 Output Dead Time
vs. Oscillator Frequency
100
VDD = 15V
4.7nF
10
10nF
200pF
470pF
1nF
1
1x104
18nF
1x105
FREQUENCY (Hz)
1x106
Short-Circuit Reference
Current vs. Temperature
120
100
80
60
40
20 VDD = 15V
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Micrel, Inc.
Oscillator Discharge
Current vs. Temperature
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4 VDD = 15V
7.2 VOSC = 2V
7.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
MIC38C4x
Output Waveform
25
20
15
10
5
0
-5 VD = 15V
-10 CL = 1nF
-15
0.0 0.2 0.4 0.6
TIME (µs)
0.8
1.0
M9999-042205
6
April 2005

6 Page



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共有リンク

Link :


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