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부품번호 | MT7201 기능 |
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기능 | 1A LED driver | ||
제조업체 | Maxic Technology | ||
로고 | |||
MT7201
1A LED driver with internal switch
DESCRIPTION
The MT7201 is a continuous mode inductive
step-down converter, designed for driving
single or multiple series connected LEDs
efficiently from a voltage source higher than
the LED voltage. The device operates from an
input supply between 7~40V and provides an
externally adjustable output current of up to 1A.
Depending upon supply voltage and external
components, this can provide up to 32 watts of
output power.
The MT7201 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current.
FEATURES
Pass 4KV ESD test
Simple low parts count
1A output current
Single pin on/off and brightness control
using DC voltage or PWM
Internal PWM filter
Soft-start
High efficiency (up to 97%)
Wide input voltage range: 7V to 40V
Output shutdown
Up to 1MHz switching frequency
Inherent open-circuit LED protection
Typical 2% output current accuracy
PIN CONFIGURATION
LX 1
5 VIN
GND 2
SOT89-5
ADJ 3
4 ISENSE
Output current can be adjusted above, or
below the set value, by applying an external
control signal to the 'ADJ' pin.
The ADJ pin will accept either a DC voltage or
a PWM waveform. Depending upon the control
frequency, this will provide either a continuous
or a gated output current. The PWM filter
components are contained within the chip.
The PWM filter provides a soft-start feature by
controlling the rise of input/output current. The
soft-start time can be increased using an
external capacitor from the ADJ pin to ground.
Applying a voltage of 0.2V or lower to the ADJ
pin turns the output off and switches the
device into a low current standby state.
The device is assembled in a SOT89-5 pin
package.
APPLICATION
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
APPLICATION CIRCUIT
47μH
0.1Ω
VIN ISENSE
MT7201 4.7μF
LX GND ADJ
(Top view)
MT7201 Rev. 1.5
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
Page 1
DPWM(HF)
TSS
fLX
TONmin
TOFFmin
fLXmax
DLX
TPD
TSD
TSD-HYS
MT7201
1A LED driver with internal switch
dimming mode
Brightness control range
Duty cycle range of PWM Frequency > 10kHz
signal applied to ADJ pin Amplitude = VREF
during high frequency
Measured on ADJ pin
PWM dimming mode
Brightness control range
Soft start time
Time taken for output
current to reach 90%
of final value after
voltage on ADJ pin
has risen above 0.3V
Operating frequency
ADJ pin floating
L=33
IOUT=1A@VLED=3.4V
Driving 1 LED
Minimum ‘ON’ time
LX switch ‘ON’
Minimum ‘OFF’ time
LX switch ‘OFF’
Recommanded maximum
operating
frequency
Recommanded duty
cycle range of output
switch at fLXmax
Internal comparator
propagation delay
Thermal shutdown threshold
Thermal shutdown hysteresis
100:1
0.16
5:1
800
300
200
200
0.3
50
165
30
1
1.1
0.7
μs
kHz
ns
ns
MHz
ns
°C
°C
Block diagram
MT7201 Rev. 1.5
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
Page 4
4페이지 MT7201
1A LED driver with internal switch
Frequency Vs. Vin(L=33uH)
900
800
700
600
500
400
300
200
100
0
5
10 15 20Vin(V)25 30 35 40
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
Frequency Vs. Vin(L=100uH)
500
450
400
350
300
250
200
150
100
50
0
5
10 15 20Vin(V2) 5 30 35 40
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
Frequency Vs. Vin(L=47uH)
700
600
500
400
300
200
100
0
5
10 15 20Vin(V)25 30 35 40
1LED
2LED
3LED
4LED
5LED
6LED
7LED
8LED
9LED
10LED
Vadj Vs. Temperature(L=47uH)
1.3
1.28
1.26
1.24
1.22
1.2
1.18
1.16
1.14
1.12
1.1
‐40
10
60 110
Temperature(Deg C)
Output current Vs. Vadj(L=47uH)
1.2
1
0.8
0.6
0.4
0.2
Rs=0.1Ohm
0 Rs=0.2Ohm
0 0.5 1 1.5 2 2.5
Vadj(V)
Output current change Vs.
2.00% Temperature(L=47uH)
1.50%
1.00%
0.50%
0.00%
‐0.50%
‐1.00%
‐1.50%
‐2.00%
‐40
10 60
Temperature(Deg C)
110
MT7201 Rev. 1.5
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
Page 7
7페이지 | |||
구 성 | 총 15 페이지수 | ||
다운로드 | [ MT7201.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
MT7200 | 350mA LED driver | Maxic Technology |
MT7201 | 1A LED driver | Maxic Technology |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |