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PDF FP7152 Data sheet ( Hoja de datos )
| Número de pieza | FP7152 | |
| Descripción | 1A LED Driver | |
| Fabricantes | Feeling Technology | |
| Logotipo |  |
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1A LED Driver with Internal Switch
FP7152
General Description
The FP7152 is a continuous current mode inductive step down converter. It can drive single or
multiple series connected LEDs. The FP7152 includes the output switch and a high-side output current
sensing circuit, which use an external resistor to set the average output current. Output current can
also be adjusted by applying an external signal to the ‘ADJ’ pin. The ADJ pin accept either a DC
voltage or a PWM dimming waveform. The PWM dimming filter components are contained within the
chip. Applying a voltage under 0.2V to the ADJ pin will turn off the output.
The FP7152 is available in the SOT89-5L package, Its space-saving footprint occupys small PCB
area for miscellaneous application fields.
Features
1A Output Current
Internal 0.5Ω 26V Power MOSFET Switch
Wide 7 to 26V Operating Input Range
20μA Shutdown Mode Current
Typical 4% Output Current Accuracy
Signal pin ON / OFF and Brightness Control
Adjustable Soft-Start
Up to 95% Efficiency
Up to 1MHz Switching Frequency
Internal Dimming Filter
Package: SOT89-5L
Applications
Low Voltage Halogen replacement LEDs
LED back-up lighting
Typical Application Circuit
VIN CIN
RS
L
SD
ADJ VIN
ISENSE LX
FP7152
GND
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. 0.64
1/14
1 page  
FP7152
DC Electrical Characteristics VIN=12V, TA=25℃ (unless otherwise specified)
Parameter
Symbol
Conditions
Min. Typ. Max.
Input voltage
Internal Regulator Start-up
Threshold
VIN
VSU VIN Rising
7 26
4.8
Quiescent Supply Current
with Output off
IINQoff ADJ pin Grounded
15 20
Quiescent Supply Current
with Output Switching
IINQon ADJ pin Floating
f=250kHz
400 800
Mean Current Sense Threshold
Voltage (Defines LED Current
Setting Accuracy)
Sense Threshold Hysteresis
ISENSE Pin Input Current
Measured on ISENSE pin
VSENSE with Respect to VIN
VADJ =1.25V
VSENSEHYS
ISENSE VSENSE =VIN -0.1
95 100 105
±15
3 10
Internal Reference Voltage
Temperature Coefficient of VREF
External Control Voltage Range
on ADJ Pin for DC Brightness
Control (1)
ADJ Pin Enable High Voltage
ADJ Pin Enable Hysteresis
VREF Measured on ADJ pin with
pin Floating
△VREF / △T
VADJ
VADJ_ON VADJ Rising
VADJ_HYS VADJ Falling
1.21
0.3
0.2
20
1.25
50
0.25
50
1.29
2.5
0.3
80
Resistance Between ADJ Pin and
VREF
Continuous LX Switch Current
RADJ
ILXmean
135 250
1.0 1.2
LX Switch ‘On’ Resistance
RLX
0.5 0.7
LX Switch Leakage Current
ILX (leak)
1
Unit
V
V
µA
µA
mV
%
µA
V
ppm/℃
V
V
mV
kΩ
A
Ω
µA
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. 0.64
5/14
5 Page 
FP7152
inductance value is recommended at higher supply voltages in order to minimize errors due to
switching delays, which result in increased ripple and lower efficiency. Higher values of inductance also
result in a smaller change in output current over the supply voltage range. The inductor should be
mounted as close to the device as possible with low resistance connections to the LX and VIN pins.
The chosen coil should have a saturation current higher than the peak output current and a continuous
current rating above the required mean output current.
DC Dimming
IOUTDC= 0.08*VADJ/RS (for 0.3< VADJ <2.5V). The ADJ pin can be driven by an external DC
voltage (VADJ) to adjust the output current to a value below the nominal average value defined by RS.
The LED current decreases linearly with the VADJ when 0.3V ≤ VADJ ≤ 2.5V, RS must be increased in
proportion to prevent IOUTDC exceeding 700mA maximum. When the VADJ falls below the threshold, 0.2V,
the output switch is turned off which allows PWM dimming.
ADJ
+
_
FP7152
GND
PWM Dimming
A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the ADJ pin,
The PWM signal is recommended above 50kHz.As shown below, to adjust the output current to a value
above or below the nominal average value set by resistor RS:
PWM
ADJ
FP7152
GND
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. 0.64
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FP7152.PDF ] | |
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