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AL5817 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - 60V LINEAR DIMMABLE LED CONTROLLER - Diodes

भाग संख्या AL5817
समारोह 60V LINEAR DIMMABLE LED CONTROLLER
मैन्युफैक्चरर्स Diodes 
लोगो Diodes लोगो 
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AL5817 pdf
Typical Application Circuit
AL5817
VIN
R4
C1
R5
VIN
AL5817
VCC
VFAULT
REF
ENB
VSET
GND
OUT
FB
D1
R2 Q1
R3
R1
R4
C1
R5
AL5817
VCC
VFAULT
REF
ENB
VSET
GND
OUT
FB
D1
R2 Q1
R3
R1
Figure 1
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
EP
Pin Name
VCC
REF
VSET
GND
FB
OUT
ENB
VFAULT
EP
Function
Supply input
Internal reference voltage.
The maximum recommended output current is 50µA and the maximum recommended capacitor
connected from this pin to GND is less than 100pF.
A potential divider from REF to VSET can be used to accurately set the output LED current.
LED current setting threshold.
The voltage on VSET sets the reference voltage for the FB pin. This pin is pulled down internally if left
floating. The capacitance if needed between VSET and GND is recommended to be less than 1nF.
Ground
Feedback input.
When control loop is operating in linear mode the FB pin will be regulated to the level set by VSET. This
pin is pulled up internally if left floating.
A capacitor may be added between FB and GND to improve noise rejection. Value needs to be limited
100pF or less.
Driving output
Chip Enable
An input voltage >2V disables the device and external transistor drive.
This pin can be used for low frequency PWM dimming of the LED current.
Input for LED-open detection.
When LED-open detection function is active, if VFAULT is brought lower than approximately 2.5V the
device output will be turned off and will auto-retry driving the output to see if the fault still exists.
A PWM dimming function will be realized by adding an open collector/drain signal on this pin.
Exposed Pad (bottom).
Recommended to be connected to a large-area contiguous copper GND plane for effective thermal
dissipation. Do not use as the IC’s only electrical GND connection.
AL5817
Document number: DS40391 Rev. 3 - 2
2 of 13
www.diodes.com
August 2018
© Diodes Incorporated

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