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PDF MT7200 Data sheet ( Hoja de datos )
| Número de pieza | MT7200 | |
| Descripción | 350mA LED driver | |
| Fabricantes | Maxic Technology | |
| Logotipo |  |
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MT7200
350mA LED driver with internal switch
DESCRIPTION
The MT7200 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
350mA. Depending upon supply voltage and
external components, this can provide up to 8
watts of output power.
The MT7200 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
350mA 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 4% output current accuracy
APPLICATION CIRCUIT
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
SOT23-5/SOT89-5 pin package.
APPLICATION
Low voltage halogen replacement LEDs
Automotive lighting
Low voltage industrial lighting
LED back-up lighting
Illuminated signs
PIN CONFIGURATION
MT7200 Rev. 1.1
LX 1
5 VIN
GND 2
SOT89-5
ADJ 3
(Top view)
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
4 ISENSE
Page 1
1 page  
MT7200
350mA LED driver with internal switch
Typical operating conditions
Efficiency Vs. Vin(L=47uH)
100.00%
95.00%
90.00%
85.00%
80.00%
75.00%
70.00%
65.00%
60.00%
5
10 15 20 25 30
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
DutyCycle Vs. Vin(L=47uH)
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
5
10 15 20 25 30
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
Frequency Vs. Vin(L=47uH)
1600
1400
1200
1000
800
600
400
200
0
5 10 15 20 25 30
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
Output current variation Vs.
10.00% Vin(L=47uH)
8.00%
6.00%
4.00%
2.00%
0.00%
5
‐2.00%
10 15 20 25 30
‐4.00%
‐6.00%
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
Efficiency Vs. Vin(L=100uH)
100.00%
95.00%
90.00%
85.00%
80.00%
75.00%
70.00%
65.00%
60.00%
5
10 15 20 25 30
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
DutyCycle Vs. Vin(L=100uH)
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
5
10 15 20 25 30
Vin(V)
1LED
2LED
3LED
4LED
5LED
6LED
7LED
MT7200 Rev. 1.1
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
Page 5
5 Page 
MT7200
350mA LED driver with internal switch
ADJ pin
The ADJ pin is a high impedance input for
voltages up to 1.35V so, when left floating,
PCB tracks to this pin should be as short as
possible to reduce noise pickup. A 100nF
capacitor from the ADJ pin to ground will
reduce frequency modulation of the output
under these conditions. An additional RC low
pass filter (10kΩ/100μF) can also be used
when driving the ADJ pin from an external
circuit. This LPF will provide filtering for low
frequency noise and provide protection
against high voltage transients.
High voltage tracks
Avoid running any high voltage tracks close to
the ADJ pin, to reduce the risk of leakage pin
currents due to board contamination. The ADJ
is soft-clamped for voltages above 1.35V to
desensitize it to leakage that might raise the
ADJ pin voltage and cause excessive output
current. However, a ground ring placed around
the ADJ pin is recommended to minimize
changes in output current under these
conditions.
Evaluation board
The MT7200 evaluation boards are available
on request.
MT7200 Rev. 1.1
www.maxictech.com
Copyright © 2008 Maxic Technology Corporation
Page 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MT7200.PDF ] | |
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