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FP7102 Datasheet(PDF) 8 Page - Feeling Technology Corp.

Part # FP7102
Description  28V, 2A Buck Constant Current Switching Regulator for White LED
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Manufacturer  FEELING [Feeling Technology Corp.]
Direct Link  http://www.feeling-tech.com.tw/
Logo FEELING - Feeling Technology Corp.

FP7102 Datasheet(HTML) 8 Page - Feeling Technology Corp.

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FP7102
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.93
8/12
Detailed Description
Voltage Reference
A built-in 2.5V reference regulator supplies FP7102 internal circuits. Also, this 2.5V reference
voltage is divided down by an internal resistive divider to provide a 0.25V precision reference voltage to
the error amplifier non-inverting terminal.
Setting the LED Current
FP7102 is a constant current buck regulator. The LEDs are connected between VOUT and FB pin
as shown in the Typical Application Circuit section. The FB pin is 0.25V in regulation. Therefore, the
LEDs current IF is set by VFB and the resistor R2 connected between FB and ground by the following
equation:
2
FB
F
R
V
I
IF should not exceed the 2A current capability of FP7102 and therefore R2 minimum value must
be approximately 0.13
Ω.
Output Voltage
The output voltage is primarily determined by the number of LEDs(n) connected between VOUT
and FB pin. Therefore, VOUT can be written as:
)
V
)
V
n
((
V
FB
F
OUT
Where VF is the forward voltage of one LED at the set LED current level (see LED manufacturer
datasheet for forward characteristics curve)
Oscillator
The fixed PWM frequency is generated by an internal oscillator. Its typical values are 320KHz.
Thermal Protection
The thermal protection is triggered when junction temperature is higher than 150
℃ that may
occurs by an abnormal heavy current loading. When this happens, the FP7102 turns output off. Once
the junction temperature is cooled down to lower than 130
℃, FP7102 starts again and turns the power
switch on.


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