SL221 Version: 0.0
■ ABSOLUTE MAXIMUM RATINGS
VIN to GND VDD to GND CS, LD, PWMD, GATE, RT to GND Junction Temperature Range Storage Temperature Range Continuous Power Dissipation(TA = +25℃) 8-Lead SOIC 16-Lead SOIC 630mW 1300mW -0.5V to +600V 13.5V -0.3V to (VDD + 0.3V) -40℃ ~ 150℃ -65 ℃~150 ℃
Synergetic Combination of ASIC & Memory
SYNCOAM Co., Ltd Version : 0.0
SL221
Universal High Brightness LED Driver ■ GENERAL DESCRIPTION
5
9
PWMD
6 7
12 13
VDD LD
8
14
ROSC
-
2, 3, 6, 7, 10, 15, 16
NC
■ ELECTRICAL CHARACTERISTICS
Symbol
Input VINDC IINSD Input DC Supply Voltage DC Input Voltage Range Shut-down Mode Supply Pin PWMD to GND Current VIN=8V, IDD(ext) =0, 500pF at Gate, RT=226kΩ, PWMD= VDD VIN=8V~550V, IDD(ext)=0, 500pF at Gate, RT=226kΩ, PWMD=VDD I DD(ext) =0~1mA, 500pF at Gate, RT=226kΩ, PWMD= VDD VDD Rising VDD Falling VIN =8V 8.0 0.5 550 1.0 V mA
■ BLOCK DIAGRAM
VIN
Regulator POR + Blanking 250mV
VDD
LD
CS
R S
Q
GATE
+ Oscillator
GND
ROSC
PWMD
■ PIN DESCRIPTION Pin #
8-SOIC 1 16-SOIC 1 VIN This pin is the input of an 8.0 - 550V linear regulator. This pin is the current sense pin used to sense the FET current by means of an external sense resistor. When this pin exceeds the lower of either the internal 250mV or the voltage at the LD pin, the GATE output goes low. 3/10
Description
Conditions
Min
Typ
Max Units
Internal Regulator VDD Internally Regulated Voltage 7.25 7.5 7.75 V
ΔVDD,LINE
Line Regulation of VDD
0
-
1.0
V
ΔVDD,LOAD UVLO ΔUVLO
■ TYPICAL APPLICATION CIRCUIT
CIN D1 CDD VDD VIN L1
CO
LD
SL221
GATE
PWMD ROSC GND
CS
RCS RT
■ PACKAGE PIN OUT
SL221 SL221
Confidential
2/10
SYNCOAM Co., Ltd.
Confidential
1/10
SYNCOAM Co., Ltd.
SL221 Version: 0.0
0 6.45 -
6.7 500
100 6.95 -
mV V mV
IIN,MAX
5.0
-
-
mA 4/10
Confidential
SYNCOAM Co., Ltd.
■ APPLICATIONS
- DC/DC or AC/DC LED driver applications - RGB backlighting LED driver - Back lighting of flat panel displays - General purpose constant current source - Signage and decorative LED lighting - Automotive - Chargers
Load Regulation of VDD VDD Under Voltage Lockout Threshold VDD Under Voltage Lockout Hysteresis Current That The Regulator Can Supply Before IC Goes Into UVLO
The SL221 is an open-loop peak current mode control LED driver IC. The SL221 can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8.0 - 550V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The SL221 includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 - 100% and a frequency of up to a few kilohertz. It also includes a 0 - 250mV linear dimming input which can be used for linear dimming of the LED current. The SL221 is ideally suited for buck LED drivers. Since the SL221 operates in open loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. The SL221 requires only three external components (apart from the power stage) to produce a controlled LED current making it an ideal solution for low cost LED drivers.
■ FEATURES
- Switch mode controller for single switch LED drivers - Open loop peak current controller - Internal 8.0 to 550V linear regulator - Constant frequency or constant off-time operation - Linear and PWM dimming capability - LED string from one to hundreds of diodes - Applications from a few mA to more than 1A output - Requires few external components for operation
3 4
5 8
GND GATE
Ground return for all internal circuitry. This pin must be electrically connected to the ground of the power train. This pin is the output GATE driver for an external N-channel power MOSFET. This is the PWM dimming input of the IC. When this pin is pulled to GND, the GATE driver is turned off. When the pin is pulled high, the GATE driver operates normally. This is the power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor to GND (≥0.1μF). This pin is the linear dimming input and sets the current sense threshold as long as the voltage at the pin is less than 250mV (typ). This pin sets the oscillator frequency. When a resistor is connected between ROSC and GND, the SL222 operates in constant frequency mode. When the resistor is connected between ROSC and GATE, the IC operates in constant off-time mode. No connection