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SM8205 Datasheet(PDF) 1 Page - SamHop Microelectronics Corp.

No. de pieza SM8205
Descripción Electrónicos  High-Power LED Driver with Integrated PWM Dimming MOSFET Driver
Download  13 Pages
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Fabricante Electrónico  SAMHOP [SamHop Microelectronics Corp.]
Página de inicio  http://www.samhop.com.tw
Logo SAMHOP - SamHop Microelectronics Corp.

SM8205 Datasheet(HTML) 1 Page - SamHop Microelectronics Corp.

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High-Power LED Driver with Integrated PWM Dimming MOSFET Driver
GENERAL DESCRIPTION
SM8205
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
● Single-string LED LCD backlighting
● High power LED drivers
● DC/DC Boost / Buck-Boost converter
● Automotive or Industrial
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
www.samhop.com.tw
1
Rev. 2.0 @ 2011/10
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).
L1
D1
Q1
Vin
8V to 48V
CIN
VCC
SS
RT
CLIM
PWMD
COMP
IREF
GND
FDBK
OVP
SC
FAULT
CS
GATE
VDD
VIN
5
6
7
8
9
10
11
13
12
14
15
16
CDD
RSLOPE
Rcs
Q2
Rsc
RL1
Cout
Rsn
Rcomp
Ccomp
RT
RL2
RR1
RR2
ROVP1
ROVP2
1
2
3
4
CCC


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