A6265KLPTR-T Allegro Microsystems Inc, A6265KLPTR-T Datasheet

A6265KLPTR-T

Manufacturer Part Number

A6265KLPTR-T

Description

IC LED CTLR HI CURRENT 16-TSSOP

Manufacturer

Allegro Microsystems Inc

Datasheet

1.A6265KLPTR-T.pdf (17 pages)

Specifications of A6265KLPTR-T

Constant Current

Yes

Internal Driver

Type - Primary

Automotive

Mounting Type

Surface Mount

Topology

PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)

Number Of Outputs

Frequency

Adjustable/Selectable

Voltage - Supply

6.5 V ~ 50 V

Package / Case

16-TSSOP (0.173", 4.40mm Width) Exposed pad

Operating Temperature

-40°C ~ 150°C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Other names

620-1394-2

Current page: 1 of 17
Download datasheet (344Kb)

D = 85%

BAT

of each LED = 3.5 V,

Features and Benefits

▪ Constant current LED drive

▪ 6.5 to 50 V supply

▪ Boost or buck-boost modes

▪ Drives between 2 and 10 LEDs in series

▪ Programmable switching frequency 100 to 700 kHz

▪ Open LED overvoltage indication and protection

▪ Single and multiple LED short indication

▪ LED short to ground and supply protection

▪ PWM dimming control

▪ 10 μA shutdown current including LED leakage

Applications:

▪ Automotive high power LED lighting systems

▪ Fog lights, reversing lights, daytime running lights

▪ Headlights

Package: 16-pin TSSOP with exposed

thermal pad (suffix LP)

A6265-DS

(V)

Buck Boost Mode

measured at VIN pin

(min)

Quantity of

Maximum

LEDs

12 V or 24 V

Power net

(Supply-referenced boost)

Fault

Flags

Enable

Buck-Boost Mode

Not to scale

(50 V max)

VREG

FF1

FF2

IREF

CKOUT

OSC

A6265

GND

VIN

Typical Application Diagrams

Automotive High Current LED Controller

Description

The A6265 is a DC-to-DC converter controller, providing a

programmable constant current output for driving high power

LEDs in series. Driving the LEDs in series ensures identical

currents and uniform brightness. For automotive applications,

optimum performance is achieved when driving between

2 and 10 LEDs at currents up to 1 A.

The A6265 provides a cost-effective solution using an external

logic-level MOSFET and minimum additional external

components. The maximum LED current is set with a single

external sense resistor and can be modified using a current

reference input. Direct PWM control is possible via the Enable

input, which also provides a shutdown mode.

This DC-DC converter can be configured as a ground-referenced

boost converter or as a supply-referenced boost converter

providing buck-boost capability. The buck-boost topology used

ensures that there is no leakage path through the LEDs when

in shutdown and no inrush current at power-up.

Integrated diagnostics and two fault outputs give indication of

undervoltage, chip overtemperature, output open circuit, LED

short circuit and LED undercurrent, and can be configured to

provide short to supply and short to ground protection for the

LED connections. A unique feature is the ability to detect one

or more shorted LEDs.

The device is provided in a 16-pin TSSOP package with exposed

thermal pad (suffix LP). It is lead (Pb) free, with 100% matte

tin leadframe plating.

D = 85%

BAT

of each LED = 3.5 V,

(V)

measured at VIN pin

(min)

Boost Mode

Quantity of

Maximum

LEDs

12 V or 24 V (50 V max)

Power net

Fault

Flags

Enable

Boost Mode

VREG

FF1

FF2

IREF

CKOUT

OSC

A6265

GND

VIN

A6265

Related parts for A6265KLPTR-T

A6265KLPTR-T Summary of contents

Page 1

Features and Benefits ▪ Constant current LED drive ▪ 6 supply ▪ Boost or buck-boost modes ▪ Drives between 2 and 10 LEDs in series ▪ Programmable switching frequency 100 to 700 kHz ▪ Open LED overvoltage ...

Page 2

... A6265 Selection Guide Part Number A6265KLP-T 96 pieces per tube A6265KLPTR-T 4000 pieces per 13-in. reel Absolute Maximum Ratings With respect to GND at T Characteristic Load Supply Voltage Pins FF1, EN Pins FF2, CKOUT Pin OSC Pin SG Pins LA, LN Pins LF Pins LP Pin SP, SN Pin VREG ...

Page 3

A6265 Terminal List Table Number – Automotive High Current LED Controller Pin-out Diagram FF1 FF2 3 ...

Page 4

A6265 VBAT Buck-Boost VREG FF2 FF1 EN VBAT Boost VREG FF2 FF1 EN See Functional Description section Automotive High Current LED Controller Functional Block Diagrams R SL VIN LED Open and V REG ...

Page 5

A6265 ELECTRICAL CHARACTERISTICS Characteristics Supply and Reference 2 V Functional Operating Range IN V Quiescent Current IN VREG Output Voltage Gate Output Drive Turn-On Time Turn-Off Time Maximum Duty Cycle Pull-Up On Resistance Pull-Down On Resistance Output High Voltage Output ...

Page 6

A6265 ELECTRICAL CHARACTERISTICS Characteristics Oscillator (continued) OSC Watchdog Period CKOUT Output High Voltage CKOUT Output Low Voltage LED Current Sense Input Bias Current LN (BB mode) 3 Input Bias Current LP (BB mode Input Bias Current LN (B ...

Page 7

A6265 The A6265 is a DC-DC converter controller that is designed to drive series-connected high power LEDs in automotive applica- tions. It provides programmable constant current output at load voltages and currents limited only be the external components. For automotive ...

Page 8

A6265 LF Single diode forward voltage reference input. Measures the forward voltage of the first LED. This value is used as a reference against the voltage on the LA pin to detect possible shorted LEDs in the LED string. Circuit ...

Page 9

A6265 LED Current Level The LED current is determined by a combination of the LED sense resistor, R threshold voltage and the voltage between the IREF pin IDL and GND ( V ). IREF The 100% current level, ...

Page 10

A6265 Diagnostics The circuit includes several diagnostic and safety functions to assist in ensuring safe operation of the LEDs, the A6265, and the external components. When any fault is detected, one or both of the fault flag outputs, FF1 and ...

Page 11

A6265 These measurements are used to determine if there is an open circuit, if one or more LEDs are shorted, if the output is shorted there is a short across the LED string. Each condition is described in ...

Page 12

A6265 gate-source junction can be used. The FF1 provides a sink current 1.3 mA. This circuit can be used to avoid most hazardous conditions and protect the circuit components from over-stress. Note that under extreme cases, the ...

Page 13

A6265 Component Selection External component selection is critical to the successful appli- cation of the LED driver. Although the inductor, the switching MOSFET, and the output capacitor are the most critical elements, the specification of the rectifying diode and sense ...

Page 14

A6265 • buck-boost configuration: ▫ The maximum average inductor current is approximately: (max (max) × (V (min L(av) LED IN ▫ The inductor current ripple is approximately × ...

Page 15

A6265 total gate charge will determine the average current required from the internal regulator and thus the power dissipation. Output Capacitor There are several points to consider when selecting the output capacitor. Unlike some switch-mode regulators, the value of the ...

Page 16

A6265 Package LP 16-Pin TSSOP with Exposed Thermal Pad 5.00±0. NOM 16X 0.10 C 0.30 0.19 0.65 BSC Automotive High Current LED Controller 8º 0º 0.20 0.09 3 NOM 4.40±0.10 6.40±0.20 0.60 ±0.15 1.00 ...

Page 17

A6265 Copyright ©2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec tions as may be required to per- mit improvements in the ...

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