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參數資料
| 型號： | EV5103-10 |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | G5103 White LED Demo Board V1.0 |
| 中文描述： | G5103白光LED演示板1.0 |
| 文件頁數： | 2/4頁 |
| 文件大?。?/td> | 143K |
| 代理商： | EV5103-10 |
Jan 21, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
2
EV5103-10
Global Mixed-mode Technology Inc.
Components List
Designation
R1
R2
R3
R4
C1
C2
C3
C4
C5
Qty
1
1
1
1
1
1
1
1
1
Value& P/N
27
_1%
120K
_1%
240K
_1%
620K
_1%
4.7μF
0.1μF
1μF
1μF
0.1μF
10μH/0.5A IDC
(LQH32CN100K31)
10μH/0.5A IDC
(976AS-100M)
0.5A/30V(MBR0530) Schottky Diode
G5103
G914C
PIC12C509A
NSCW100
Description
Vendor
Current Sense Resistor
Feedback Resistor (recommend)
PWM Dimming Control Bias Resistor
PWM Dimming Control Mixer Resistor
Input Capacitor
Output Capacitor
Input Capacitor
Output Capacitor
Bypass Capacitor
Std
TAIYO YUDEN
Inductor
MURATA
L1
1
Inductor
TOKO
D1
U1
U2
U3
SW1~3
LED1~4
1
1
1
1
3
4
ON Semi
Global Mixed-Mode Technology
http://www.gmt.com.tw
Miocrochip
Std
NICHIA corporation
Micro Power Step-up DC/DC Converter
Mirco power LDO regulator. V
OUT
=3.0V
8 bits micro-controller
Push button switch
White LED
Circuit Description
The demo board is configured as a constant current supply. Current regulation is accomplished by regulating
the voltage across a current sense resistor R1. For dimming the LEDs is to inject a pulse width modulated
(PWM) voltage for analog dimming. With this method, the PWM control voltage is converted to its equivalent
analog control voltage. The demo board is designed so that the negative duty cycle from 0% to 100% varies
the LED current from 0mA to 20mA. The output current increases as the duty cycle increases. Use the
equation below to calculate the correctly resistor values.
V
BAT
:
Li-Ion battery power input, bypass to ground with a 4.
7
μF MLCC capacitor.
V
BIAS
:
+3.0VDC provide a PWM dimming DC bias voltage. It is generated by G914C from V
BAT
.
R1:
is LED current sense resistor. R1= 0.60V / I
LED,MAX
= 0.60V / 20mA = 30
R2:
is feedback resistor, 120K
is recommended.
R4:
is PWM dimming control mixer resistor. The value is depended on PWM dimming control signal
amplitude. R4= (V
H
- V
L
) / (0.6V / 120K
). (maximum value, a little small value could be used)
For 3.0V PWM control signal: R4= 3V / (0.6V / 120K
) = 600K
.
For 3.3V PWM control signal: R4= 3.3V / (0.6V / 120K
) = 660K
.
For 5.0V PWM control signal: R4= 5V / (0.6V / 120K
) = 1M
.
R3:
is PWM dimming control bias resistor. The value is depended on V
BIAS
voltage.
R3=( V
BIAS
– V
FB
) /[(0.6V/120 K
)+(V
FB
/ R4)].
For 3VDC V
BIAS
:= (3.0V – 1.2V) / [(0.6V/120 K
)+(1.2V / 600 K
)] = 257 K
.
For 3.3VDC V
BIAS
:= (3.3V – 1.2V) / [(0.6V/120 K
)+(1.2V / 660 K
)] = 308 K
For 5VDC V
BIAS
:= (5.0V – 1.2V) / [(0.6V/120 K
)+(1.2V / 1000 K
)] = 612 K
After choose suitable resistors, designer should check I
LED
again.
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