SM8200 Datasheet, PDF (1/1 Pages) M.S. Kennedy Corporation – High Efficiency Step Down LED Driver

Preliminary Datasheet
High Efficiency Step Down LED Driver
SM8200
GENERAL DESCRIPTION
The SM8200 is a High efficiency step-down LED Driver,
It has very wide input voltage range from 8V to 48V,
The device is designed to operate in critical conduction
mode (CrM) control scheme (This operating mode
results in an average LED current which is equal to half
of the peak switching current) optimized to drive high
current LEDs. Thus highly efficient and accurate LED
current regulation can be achieved. In CrM, the
switching frequency will vary with line, load , inductance
and switching loss, the current of the inductor starts at
zero each switching cycle. So, external power MOSFET
can significantly be reduced the peak spike voltage. A
external sense resistor (RSN) sets the peak inductor
current, which is regulated at 300mV (Typically), under
this operating mode results in an average current which
is equal to half of the peak switching current.
The SM8200 offers the following protection functions:
LED open protection, LED short-circuit protection and IC
junction over-temperature shutdown with auto recovery
feature. The device is available in the low profile 6-lead
SOT-23 package and is ideal for space constrained
applications.
FEATURES
● Wide input operating voltage range from 8V to 48V
● Low current sense threshold of 300mV
● Power efficiency up to 94%
● Application from a few mA to more than 1A output
● LED string from one to hundreds
● Excellence Control scheme (CrM)
● LED short-circuit protection (SCP)
● LED open-voltage protection (OVP)
● Junction over-temperature shutdown protection
● Cycle-by-cycle current limit
● Providing SOT-23 6-lead Package
APPLICATIONS
● MR16
● High power LED drivers
● Signage and decorative LED lighting
● Automotive or Industrial
TYPICAL APPLICATION CIRCUIT
8VDC ～ 48VDC
CIN
SM8200
VIN
ZCD
CT
GATE
C1
GND
CS
www.samhop.com.tw
1
D1
Cout
L1
Q1
RSN
Rev. 1.0 @ 2011/12