L5101 Просмотр технического описания (PDF) - Unisonic Technologies
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L5101 Datasheet PDF : 9 Pages
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L5101
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
Recommended Component Selection
Inductor Selection: A 10µH inductor is recommended for most applications.
Capacitor Selection: The small size of ceramic capacitors (1µF input with 1µF output ) are sufficient, X5R
and X7R types are recommended
Diode Selection: An Schottky diode rated at 100mA ~ 200mA is sufficient for most applications.
LED Current Control
A feedback resistor (precision 1% recommended) as feedback resistor control the LED current.(RFB in Figure 1)
- Feedback reference voltage : 95mV.
- LED current is 95mV/RFB.
- The formula for RFB selection : RFB=95mV/ILED
L
10μH
D1
VIN
C1
1μF
RB521S-30
VIN
SW
C2
1μF
SHDN OVP
GND
FB
L5101
RFB
4.7Ω
Fig.1 Dimming Control with a PWM Signal
Open-Circuit Protection
When a high output voltage exceeds maximum 33V, the built-in OVP (Over Voltage Protection) will be triggered to
prevent the damage resulting from an open circuit condition.
Dimming Control
There are three different ways of dimming control circuits as follows:
1. Using a PWM signal
VIN
C1
1μF
L
10μH
D1
RB521S-30
VIN
SW
SHDN OVP
GND
FB
L5101
PWM
R2
51KΩ
R1
1KΩ
RFB
4.7Ω
Fig.2 Dimming Control Using a PWM Signal
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 9
QW-R103-026,A
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