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參數(shù)資料
| 型號(hào)： | G5117 |
| 廠商： | Global Mixed-mode Technology Inc. |
| 英文描述： | High Efficiency, Constant Current Output for 4 Series LEDs Driver |
| 中文描述： | 高效率，恒定的4系列LED的驅(qū)動(dòng)電流輸出 |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大?。?/td> | 424K |
| 代理商： | G5117 |
Ver: 1.1
Sep 20, 2004
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G5115/G5117/G5119
Global Mixed-mode Technology Inc.
Table 2. Recommended Output Capacitors
PART
VALUE (F)
VOLTAGE
RATING (V)
VENDOR
TMK107BJ104MA
0.1
25
Tayo Yuden
TMK316BJ105KL
1
25
Tayo Yuden
TMK325BJ475MN
4.7
25
Tayo Yuden
Input Capacitor Selection
For good input voltage filtering the capacitor value can
be increased. Low ESR ceramic capacitors are rec-
ommended. A 4.7F ceramic input capacitor is suffi-
cient for most applications.
Table 3. Recommended Input Capacitors
PART
VALUE (F)
VOLTATE
RATING (V)
VENDOR
LMK212BJ105MG
1
10V
Tayo Yuden
JMK212BJ475MG
4.7
6.3V
Tayo Yuden
JMK212BJ106MG
10
6.3V
Tayo Yuden
Diode Selection
To achieve high efficiency a Schottky diode must be
used. The current rating of the diode must meet the
peak current rating of the converter. Schottky diodes,
with their low forward voltage drop and fast switching
speed, are best match for the G5115/G5117/G5119.
Table 4. Recommended Diodes
PART
REVERSE
VOLTAGE (V)
VENDOR
MBR0520
20
On Semiconductor
Setting The LED Current
The Converter regulates the LED current by regulating
the voltage across the current sense resistor (RS). The
voltage across the sense resistor is regulated to the
internal reference voltage of V(FB)=250mV. The LED
Current can be calculated:
VFB
0.25V
ILED =
RS
=
RS
The current programming method is used when the
brightness of the LEDs is fixed or control by a PWM
signal applied to the SHDN pin. When using a PWM
signal on the SHDN pin, the LED brightness is only
dependent on the PWM duty cycle, independent of the
PWM frequency or amplitude, which simplifies the sys-
tems.
Layout considerations
In all switching power supplies the layout is an impor-
tant step in the design, especially at high peak currents
and switching frequencies. If the layout is not carefully
done, the regulator might show noise problems and
duty cycle jitter. The input capacitor should be placed
as close as possible to the input pin for good input
voltage filtering. The inductor and diode must be placed
as close as possible to the switch pin to minimize noise
coupling into other circuits. Since the feedback pin and
network is a high impedance circuit, the feedback net-
work should be routed away from the inductor.
相關(guān)PDF資料 |
PDF描述 |
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| G5118P8U | High Efficiency, Constant Current Output for 8 Series LEDs Driver |
| G5118 | High Efficiency, Constant Current Output for 8 Series LEDs Driver |
| G5119P8U | High Efficiency, Constant Current Output for 4 Series LEDs Driver |
| G5119 | High Efficiency, Constant Current Output for 4 Series LEDs Driver |
| G5130-30T13UF | WIRE, PTFE, A, YELLOW, 7/0.12MM, 100M; Area, conductor CSA:0.079mm2; Conductor make-up:7/0.12mm; Voltage rating, AC:300V; Current rating:3A; Colour, primary insulation:Yellow; Material, primary insulation:PTFE; Diameter, RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G5117T1U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:High Efficiency, Constant Current Output for 4 Series LEDs Driver |
| G5118 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:High Efficiency, Constant Current Output for 8 Series LEDs Driver |
| G5118P8U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:High Efficiency, Constant Current Output for 8 Series LEDs Driver |
| G5119 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:High Efficiency, Constant Current Output for 4 Series LEDs Driver |
| G5119P8U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:High Efficiency, Constant Current Output for 4 Series LEDs Driver |
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