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A8514 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - High Efficiency Fault Tolerant LED Driver - Allegro

भाग संख्या A8514
समारोह High Efficiency Fault Tolerant LED Driver
मैन्युफैक्चरर्स Allegro 
लोगो Allegro लोगो 
पूर्व दर्शन
1 Page
		
<?=A8514?> डेटा पत्रक पीडीएफ

A8514 pdf
A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
DESCRIPTION (CONTINUED)
The A8514 is provided in a 20-pin TSSOP package (suffix LP) with
an exposed pad for enhanced thermal dissipation. It is lead (Pb) free,
with 100% matte-tin leadframe plating.
SELECTION GUIDE
Part Number
Packing [1]
A8514KLPTR-T
4000 pieces per 13-in. reel
1 Contact Allegrofor additional packing options
ABSOLUTE MAXIMUM RATINGS [2]
Characteristic
Symbol
LEDx Pins
OVP Pin
VIN, VSENSE, GATE Pins
SW Pin
¯F¯ ¯A ¯¯U¯¯L¯ ¯T¯  Pin
ISET, FSET, APWM, COMP Pins
All Other Pins
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
TA
TJ(max)
Tstg
Notes
VSENSE and GATE pins should not exceed VIN
by more than 0.4 V
Continuous
t < 50 ns
Range K
Rating
–0.3 to 55
–0.3 to 60
–0.3 to 40
–0.6 to 62
–1.0
-0.3 to 40
–0.3 to 5.5
–0.3 to 7
–40 to 125
150
–55 to 150
Unit
V
V
V
V
V
V
V
V
°C
°C
°C
2 Stresses beyond those listed in this table may cause permanent damage to the device. The Absolute Maximum ratings are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the Electrical
Characteristics table is not implied. Exposure to Absolute Maximum-rated conditions for extended periods may affect device reliability.
Table of Contents
Specifications
Thermal Characteristics
Pin-out Diagram and Terminal List
2
3
Setting the current sense resistor
3 Input UVLO
Characteristic Performance
8 VDD
Functional Description
11 Shutdown
Enabling the IC
11 Fault protection during operation
Powering up: LED pin short-to-ground check
11 Application Information
Soft start function
13
Frequency selection
13
Sync 14
LED current setting and LED dimming
16
PWM dimming
16
Design Example for Boost Configuration
Design Example for SEPIC Configuration
Package Outline Drawing
Appendix A. Feedback Loop Calculations
APWM pin
17 Power Stage Transfer Function
Analog dimming
19 Output to Control Transfer Function
LED short detect
Overvoltage protection
Boost switch overcurrent protection
19 Stabilizing the Closed Loop System
20
22
Measuring the Feedback Loop Gain and Phase Margin
Input overcurrent protection and disconnect switch
23
24
24
24
24
25
27
27
31
35
A-1
A-1
A-2
A-4
A-6
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2

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