SM8205

PIN ASSIGNMENTS

1

2

3

4

5

6

10

7

8

9

11

12

13

14

15

16

VCC

SS

RT

CLIM

PWMD

COMP

IREF

GND

FDBK

OVP

SC

FAULT

CS

GATE

VDD

VIN

ORDERING INFORMATION

PIN DESCRIPTIONS

SOP-16 (Top View)

Description

Pin No.

Name

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.

1

VCC

2

SS

Soft-start time programming pin. Connect capacitor from SS pin to GND to program converter

soft-start time.

3

RT

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.

4

CLIM

5

PWMD

PWM dimming input. High level is normal operation, when is pulled to GND or left open, switching

of the SM8205 is disabled.

6

COMP

Error-amplifier output. Connect an RC network from COMP to GND for stable operation.

7

IREF

The voltage at this pin sets the output current level. The current reference can be set using a

resistor divider from VCC pin.

8

GND

Ground return for all circuit.

9

FDBK

LED current sense input. Connect a sense resistor from LED strings to GND to regulate LED

output current.

10

OVP

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.

11

SC

Slope compensation for current sense. A resistor between SC and GND will program the slope

compensation.

12

FAULT

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.

13

CS

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.

14

GATE

Output gate driver pin to drive an external N-channel power MOSFET.

15

VDD

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.

VIN

16

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.

Part Number

Marking

SM8205SL

△

xxxxxx

SM8205SL

Tube

50

2

www.samhop.com.tw

Rev. 2.0 @ 2011/10

Note: The letter “S” is marked for SOP package, and Letter “L” is

marked for Lead Free parts.