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38HC43 の電気的特性と機能

38HC43のメーカーはMicrel Semiconductorです、この部品の機能は「MIC38HC43」です。


製品の詳細 ( Datasheet PDF )

部品番号 38HC43
部品説明 MIC38HC43
メーカ Micrel Semiconductor
ロゴ Micrel Semiconductor ロゴ 




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38HC43 Datasheet, 38HC43 PDF,ピン配置, 機能
www.DataSheet.co.kr
MIC38HC42/3/4/5
Micrel, Inc.
MIC38HC42/3/4/5
BiCMOS 1A Current-Mode PWM Controllers
General Description
The MIC38HC4x family are fixed frequency current-mode
PWM controllers with 1A drive current capability. Micrel’s
BiCMOS devices are pin-compatible with 384x bipolar de-
vices. Their high output drive, with fast rise and fall times,
combined with low startup current make it an ideal PWM
controller where high efficiency is required.
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 UC384x 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 effi-
ciency, especially at lower supply voltages. The MIC38HC4x
also features a trimmed oscillator discharge current and
bandgap reference.
MIC38HC4x-1 is available in 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 performance and power dissipation.
Features
• Fast 20ns output rise and 15ns output fall times
• –40°C to +85°C temperature range
exceeds UC284x specifications
• High-performance, low-power BiCMOS Process
• Ultralow start-up current (50µA typical)
• Low operating current (4mA typical)
• High output drive (1A peak current, HC version)
• CMOS outputs with rail-to-rail swing
• Current-mode operation up to 500kHz
• 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
Functional Diagram
VDD
7 (12)
VREF
8 (14)
RT/CT
4 (7)
FB
2 (3)
2.5V
35V
5V
Reference
Oscillator
2R
R
UVLO
*
TQ
S
R
Q
(VD)
(11)
OUT
6 (10)
(PGND)
(8)
*
COMP GND*(AGND) ISNS
1 (1)
5 (9)
3 (5)
( ) pins are on MIC38HC4x-1 (14-lead) versions only
* MIC38HC4x (8-lead) versions only
MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only
MIC38HC44, MIC38HC45 (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
April 2005
1
M9999-042205
Datasheet pdf - http://www.DataSheet4U.net/

1 Page





38HC43 pdf, ピン配列
www.DataSheet.co.kr
MIC38HC42/3/4/5
Pin Configuration
MIC38HC4x
COMP 1
8 VREF
FB 2
7 VDD
ISNS 3
6 OUT
RT/CT 4
5 GND
8-Pin DIP (N)
8-Lead SOIC (M)
Micrel, Inc.
MIC38HC4x-1
COMP 1
NC 2
FB 3
NC 4
ISNS 5
NC 6
RT/CT 7
14 VREF
13 NC
12 VDD
11 VD
10 OUT
9 AGND
8 PGND
14-Pin DIP (-1BN)
14-Lead SOIC (-1BM)
Pin Description
Pin Number
N, M, MM
1
Pin Number
-1BN, -1BM
1
2
23
4
35
6
47
5
8
9
6 10
11
7 12
13
8 14
Pin Name
COMP
NC
FB
NC
ISNS
NC
RT/CT
GND
PGND
AGND
OUT
VD
VDD
NC
VREF
Pin Function
Compensation: Connect external compensation network to modify the error
amplifier output.
Not internally connected.
Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output
voltage.
Not internally connected.
Current Sense (Input): Current sense comparator input. Connect to current
sensing resistor or current transformer.
Not internally connected.
Timing Resistor/Timing Capacitor: Connect external RC network to select
switching frequency.
Ground: Combined analog and power ground.
Power Ground: N-channel driver transistor ground.
Analog Ground: Controller circuitry ground.
Power Output: Totem-pole output.
Power Supply (Input): P-channel driver transistor supply input. Return to
power ground (PGND).
Analog Supply (Input): Controller circuitry supply input. Return to analog
ground (AGND).
Not internally connected.
5V Reference (Output): Connect external RC network.
April 2005
3
M9999-042205
Datasheet pdf - http://www.DataSheet4U.net/


3Pages


38HC43 電子部品, 半導体
www.DataSheet.co.kr
MIC38HC42/3/4/5
Typical Characteristics
Oscillator Frequency
Configuration
100
200pF
470pF
1nF
1.8nF
10
4.7nF
10nF
VDD = 15V
1
1x104
1x105
1x106
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
02468
ERROR AMPLIFIER OUTPUT (V)
MIC38C/HC42/43 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
Datasheet pdf - http://www.DataSheet4U.net/

6 Page



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部品番号部品説明メーカ
38HC43

MIC38HC43

Micrel Semiconductor
Micrel Semiconductor


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