SM8205 Datasheet, PDF (2/13 Pages) M.S. Kennedy Corporation – High-Power LED Driver with Integrated PWM Dimming MOSFET Driver

PIN ASSIGNMENTS
VCC 1
SS 2
RT 3
CLIM 4
PWMD 5
COMP 6
IREF 7
GND 8
16 VIN
15 VDD
14 GATE
13 _FAULT
12 CS
11 SC
10 OVP
9 FDBK
ORDERING INFORMATION
SM8205
Part Number
Marking
Tube
SM8205SL
SM8205SL
△xxxxxx
50
Note: The letter “S” is marked for SOP package, and Letter “L” is
marked for Lead Free parts.
SOP-16 (Top View)
PIN DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
VCC
SS
RT
CLIM
PWMD
COMP
IREF
GND
FDBK
OVP
SC
CS
FAULT
GATE
VDD
VIN
Description
5V Low-dropout voltage regulator. Bypass to GND with at least a 4.7uF low-ESR ceramic
capacitor. It provides 2% accurate reference voltage to external IREF and CLIM terminal use for
setting control loop reference.
Soft-start time programming pin. Connect capacitor from SS pin to GND to program converter
soft-start time.
Connect a resistor from RT to GND to program the switching frequency.
This pin provides a programmable input current limit for the converter. The current limit can be set
by using a resistor divider from the VCC pin, soft-start can also be provided using this pin.
PWM dimming input. High level is normal operation, when is pulled to GND or left open, switching
of the SM8205 is disabled.
Error-amplifier output. Connect an RC network from COMP to GND for stable operation.
The voltage at this pin sets the output current level. The current reference can be set using a
resistor divider from VCC pin.
Ground return for all circuit.
LED current sense input. Connect a sense resistor from LED strings to GND to regulate LED
output current.
Over-voltage protection sense input. When this pin voltage exceeds 1.2V, the GATE output of the
SM8205 is turned off and FAULT goes low. The IC will turn on again until input power is recycled.
Slope compensation for current sense. A resistor between SC and GND will program the slope
compensation.
Current sense positive input. Connected to external current sense resistor which in turn is
connected to the source of the external power N-MOSFET as well as an external slope
compensation resistor.
External dimming MOSFET gate driver. This pin is pulled to Ground when there is an output short
circuit or output over voltage fault conditions, and then disconnect the load from voltage source.
Output gate driver pin to drive an external N-channel power MOSFET.
This pin is a regulated 10V supply for two gate driver (GATE and FAULT), It must be bypassed
with a low-ESR ceramic capacitor at least 1.0uF to GND.
Power supply input pin. Voltage input range from 8V to 46V, place a bypass capacitor 1uF～10uF
to ground as close to the device as possible in the circuit board layout.
www.samhop.com.tw
2
Rev. 2.0 @ 2011/10