MT7860 LED Driver Datasheet

MT7860 Datasheet, PDF, Equivalent


Part Number

MT7860

Description

PWM/Analog Dimmable APFC BUCK LED Driver

Manufacture

Maxic Technology

Total Page 7 Pages
Datasheet
Download MT7860 Datasheet


MT7860
For buy, please contact: info@chimicron.com Skype:info@chimicron.com www.chimicron.com
Maximizing IC Performance
MT7860
PWM/Analog Dimmable APFC BUCK LED Driver
DESCRIPTION
The MT7860 is a high power factor (PF) Buck
LED Driver. It works under Quasi-Resonant
Mode (QRM) which reduces both of current and
voltage stress greatly, helps to improve EMI
performance and efficiency. The output LED
current is sensed by MT7860 with
Quasi-full-cycle sensing (QCS) technology,
accurate LED current regulation is achieved.
The MT7860 is specially designed for intelligent
dimming application. Dimming of LED current
can be achieved by decoded PWM or analog
signal. The accuracy and consistency of LED
current, especially at low dimming level, is
achieved by the internal trimming decoder. As
Dimming level becomes lower, the switching
control method goes from QRM to PFM (Pulse
Frequency Modulation) seamlessly. Then smaller
output current and lower switching loss are
achieved.
MT7860 provides varies of protections to
improve the system reliability, including over
voltage protection (OVP), over current
protection(OCP), short circuit protection (SCP)
and over temperature compensation, etc.
FEATURES
Single-stage active power factor correction
(PFC > 0.90)
High precision LED current (±3%)
Good Line and Load Regulation (±2%)
Quasi-Resonant mode (QRM) operation
Various protection schemes.
PWM Dimming/ analog Dimming (100:1)
Available in SOP8 package
APPLICATIONS
Dimming lighting application
Smart LED Lamps with 2.4G/BLE/ZigBee
Other LED lighting application
Typical Application Circuit
Vin_ac
BRG
ZigBee /
BLE / 2.4G
MCU
R9
LED+
C7 R7 C8
LED-
D3
L2
MT7860
1
VDD
8
DRV
R5
2
PWM
5
CS
63
DSEN CLPF
47
COMP GND
R6 C9 C4 C10
R8
C11
M1
RS
Rev. 1.25
Page 1
For buy, please contact: info@chimicron.com Skype:info@chimicron.com www.chimicron.com

MT7860
For buy, please contact: info@chimicron.com Skype:info@chimicron.com www.chimicron.com
Maximizing IC Performance
MT7860
PWM/Analog Dimmable APFC BUCK LED Driver
ABSOLUTE MAXIMUM RATINGS
VDD Pin Voltage
DRV Pin Voltage
COMP/CS/DSEN/PWM/CLPF Pins Voltage
Lead Temperature (soldering, 10 sec.)
Storage Temperature
Junction Temperature (Tj)
-0.3V to VDD Clamp
-0.3V to VDD
-0.3V to 5V
260°C
-55°C to 150°C
150°C
Recommended operating conditions
Supply voltage
Operating Temperature (Environment)
9V to 28V
-40°C to 105°C
Thermal resistance
Junction to ambient (RθJA)
PIN CONFIGURATIONS
128°C/W
VDD
PWM
CLPF
COMP
18
27
36
45
(SOP8)
DRV
GND
DSEN
CS
Chip Mark
MT7860
YY WW xx
Manufacture code
Week code
Year code
PIN DESCRIPTION
Name
VDD
PWM
CLPF
COMP
Pin No.
1
2
3
4
CS
DSEN
GND
DRV
5
6
7
8
Description
Power Supply pin.
Digital PWM Signal input pin.
Analog Dimming Signal input pin / PWM dimming signal filtering capacitor
Internal EAs output pin. Connect a capacitor to ground for frequency
compensation.
Current Sense pin.
Feedback pin for inductor zero current crossing detection.
Ground pin.
Drive signal for external Power MOSFET.
Rev. 1.25
Page 2
For buy, please contact: info@chimicron.com Skype:info@chimicron.com www.chimicron.com


Features Maximizing IC Performance MT7860 PWM/An alog Dimmable APFC BUCK LED Driver DES CRIPTION The MT7860 is a high power fac tor (PF) Buck LED Driver. It works unde r Quasi-Resonant Mode (QRM) which reduc es both of current and voltage stress g reatly, helps to improve EMI performanc e and efficiency. The output LED curren t is sensed by MT7860 with Quasi-full-c ycle sensing (QCS) technology, accurate LED current regulation is achieved. Th e MT7860 is specially designed for inte lligent dimming application. Dimming of LED current can be achieved by decoded PWM or analog signal. The accuracy and consistency of LED current, especially at low dimming level, is achieved by t he internal trimming decoder. As Dimmin g level becomes lower, the switching co ntrol method goes from QRM to PFM (Puls e Frequency Modulation) seamlessly. The n smaller output current and lower swit ching loss are achieved. MT7860 provide s varies of protections to improve the system reliability, including over voltage protection (OVP), ov.
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