SM8205 Datasheet, PDF (1/13 Pages) M.S. Kennedy Corporation – High-Power LED Driver with Integrated PWM Dimming MOSFET Driver

SM8205
High-Power LED Driver with Integrated PWM Dimming MOSFET Driver
GENERAL DESCRIPTION
The SM8205 is a current mode control wide-input
voltage (8V to 48V) LED driver IC specifically designed
to power one or multi-strings of high power LEDs. The
10V gate driver allow the use of standard level MOSFET
. The low voltage 5.0V VCC is used to power the internal
logic and also acts as a reference voltage to set the
current level. An external resistor sets the adjustable
switching frequency of the SM8205. The switching
frequency can be between 100KHz and 1MHz to
optimize efficiency, performance or external component
size. This controller uses a peak-current control scheme
(with programmable slope compensation), and includes
an internal transconductance amplifier to control the
output current in closed loop, enabling high output
current accuracy. Programmable MOSFET current limit
enables current limiting during input under-voltage and
output overload conditions. An internal 8V～48V linear
regulator powers the IC, elimination the need for a
separate power supply for the IC. The SM8205 provides
a TTL compatible PWM dimming input that can accept
an external control signal with a duty ratio of 0～100%
and frequency of up to a few kilohertz. The SM8205 also
provides a FAULT output which can be used to
disconnect the LEDs in case of a fault condition, using
an external disconnect N-channel MOSFET. The
SM8205 also offer the following protection functions:
LED open protection (OVP), LED short-circuit protection
(SCP), Junction over-temperature shutdown and input
under voltage lockout (UVLO).
FEATURES
● Wide input operating voltage range from 8V to 48V
● Internal 2% reference voltage
● Integrated PWM dimming N-channel MOSFET driver
● Dimming ratio: 1000:1
● 100KHz to 1MHz programmable high-frequency
operation
● Programmable slope compensation
● Input under-voltage protection
● LED short-circuit protection (SCP)
● LED open-voltage protection (OVP)
● Junction over-temperature shutdown protection
● Drivers LEDs in Boost, Buck-Boost, SEPIC Topology
● Cycle-by-cycle current limit
● Soft start
● Providing SOP-16 Package
APPLICATIONS
● Single-string LED LCD backlighting
● High power LED drivers
● DC/DC Boost / Buck-Boost converter
● Automotive or Industrial
TYPICAL APPLICATION CIRCUIT
L1
Vin
8V to 48V
CIN
CCC
1
VCC
2
SS
RT ₃
RT
RL1
RL2
4
CLIM
5
PWMD
Ccomp Rcomp ₆
COMP
RR1
7
IREF
16
VIN
CDD
15
VDD
14
GATE
12
Rsc
CS
13
FAULT
11
SC
RSLOPE
9
FDBK
8
10
RR2
GND
OVP
D1
Cout
Q1
Rcs
ROVP1
ROVP2
Q2
Rsn
www.samhop.com.tw
1
Rev. 2.0 @ 2011/10