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MT7814BD Datasheet Preview

MT7814BD Datasheet

High Efficiency High Precision Buck Constant Current Driver

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MT7814BD
High Efficiency High Precision Buck Constant Current Driver
DESCRIPTION
MT7814BD is a high precision LED constant
current controller operating at critical conduction
mode (CRM) with zero current switched-on and
peak current switched-off. It’s mainly targeted for
non-isolated buck LED power systems.
Critical conduction mode ensures that the
MT7814BD turns on the internal power MOSFET
when the inductor current reaches zero, reducing
the power MOSFET switching loss, and
achieving more than 95% efficiency. With critical
conduction mode, and the input compensation,
MT7814BD can achieve precise output current
and excellent line regulation and load regulation.
MT7814BD embedded with internal power
MOSFET, it can achieve simplified peripheral
circuits and low BOM cost.
MT7814BD has wide working voltage range,
which is suitable for full-range AC input.
MT7814BD provides various protection features
to improve the system reliability, including over
current protection (OCP), short circuit protection
(SCP), adjustable over voltage protection (OVP)
and thermal adjustment, etc.
FEATURES
Critical Conduction Mode, insensitive to the
inductance.
High efficiency (up to 95%)
Highly accurate constant LED current
Cycle-by-cycle current limiting
LED short circuit protection
Adjustable OVP through external resistor
Leading edge blanking technique
Under-voltage lockout (UVLO) protection
Thermal adjustment
Available in DIP7 package
APPLICATIONS
LED bulb, LED tube, LED signal and
landscape lamp
LED stage light, LED candle light, LED corn
light, etc.
General purpose constant current source
Typical Application Circuit
VM
Rst1
Rst2
Vin_ac
C1 C2
CO
MT7814BD
VCC DRAIN
NC DRAIN
VOVP
GND
CS
Rcs
Email: sales@maxict1ech.com
Tel: 86-10-62662828
www.maxictech.com
Copy right © 2015 Maxic Technology Corporation
Rev. 1.00
Page 1




Maxic Technology

MT7814BD Datasheet Preview

MT7814BD Datasheet

High Efficiency High Precision Buck Constant Current Driver

No Preview Available !

MT7814BD
High Efficiency High Precision Buck Constant Current Driver
ABSOLUTE MAXIMUM RATINGS
VCC maximum sink current
VOVP (over voltage protection pin voltage)
DRAIN (internal HV power MOS drain voltage)
SOURCE (internal HV power MOS source voltage)
CS (current sense pin input voltage)
PDMAX (maximum power dissipation )
Storage Temperature range
Junction Temperature (Tj)
5mA
-0.3 ~ 6V
-0.3V ~ 500V
-0.3 ~ 40V
-0.3V ~ 6V
1.2W
-55°C ~ 150°C
150°C
RECOMMENDED OPERATING CONDITIONS
Operating Temperature
Output Current
-40°C ~ 105°C
<350mA @VOUT=72V
<480mA @VOUT=36V
THERMAL RESISTANCE
Junction to ambient (RθJA)
PIN CONFIGURATIONS
70°C/W
GND
VOVP
NC
VCC
17
2
36
45
(DIP7)
CS
DRAIN
DRAIN
Chip Mark
MT7814BD
X YY WW XX
Manufacture code
Week code
Year code
Manufacture code
PIN DESCRIPTION
Name
GND
VOVP
NC
VCC
DRAIN
CS
Pin No.
1
2
3
4
5/6
7
Description
Chip ground
Over voltage protection pin
No connection
Power supply, internal clamped at 15.5V
Drain of internal high-voltage power MOSFET
Current sense input, connect a sense resistor to ground
Email: sales@maxictech.com
Tel: 86-10-62662828
www.maxictech.com
Copy right © 2015 Maxic Technology Corporation
Rev. 1.00
Page 2


Part Number MT7814BD
Description High Efficiency High Precision Buck Constant Current Driver
Maker Maxic Technology
Total Page 7 Pages
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