Download Flash mode

BlueChips Technology
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
A Premier Design Solutions Company…..
Switching Control
Current regulator for
1W White LED
BCT 3611S
June 2005
Solid State Lighting
The Features: BCT 3611S
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
Applications:
High Power White LED Torch, Head Lamp
White LED Driver for Mobile Phone
Handheld Electronics
Maximum output current: 350mA
Minimal external components (with NO coil)
Target low cost application where three standard batteries are preferred
Two operation mode: Continuous or Flash:
Enter flash mode without hardware switch (by power ON, OFF ->ON)
SHDNB is used by µC to turn on/off the converter
Internal thermal protection circuit
Wide operation temperature: -20 to 70 deg C
Available in Pb-free SOP8 package
June 2005
Solid State Lighting
System Advantages:
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
High Output current (max. 350mA)
Advanced high frequency switching control, very
low drop out voltage
Condition: Supply voltage > LED forward voltage
Two Mode Operation: Continuous or Flash
 Enter flash mode without hardware switch
Not Standby mode
 Minimize the risk of battery leakage and corrosion
Multi source of LEDs
 Current regulator (irrelevant to the LED forward voltage)
High efficiency and lower power consumption
 Extend the battery life
June 2005
Solid State Lighting
BCT3611S Application
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
0.3125 S 0.3125 S
1mF
100mF
+
1mF
LED ON
LED OFF
6, 7
3
VIN
VOUT
3*1.5V cell
BCT3611S
CS
SHDNB
0.33 ohm
GND
FLASH
1 watt LED
2.2uF
Connected to GND,
if flash mode do not needed
June 2005
Solid State Lighting
BCT3611 vs xxx7135
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
BCT3611
xxx7135
Minimal External
Components
Output capacitor, flash capacitor,
current sense resistor
Max Output Current
350mA (600mA)
350mA
Operating Voltage
1.8 ~ 6V
2.7 ~ 6V
Output Current control
Resistor at CS pin
Fixed
Switching frequency
1MHz
Linear
Flash mode
Continuous mode or flash mode (one
external capacitor)
Not support
Shunt down Control
Yes, PWM by MCU
Not support
Thermal Protection
110 deg C
120 deg C
Technology
CMOS
BiCOMS
Power Loss
Drop out voltage * Current
Drop out voltage * Current
Package
SOP8
SOT89-3+1
June 2005
Solid State Lighting
BCT 3611S Status
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
E/S: Available in July
Demo board: Available in July
Production: Q4 2005
June 2005
Solid State Lighting
BLUEC H I PS
藍 科 有 限 公 司
w w w. b l u e c h i p s t e c h. c o m
Thank You !
Questions & Answer
June 2005
Solid State Lighting