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A6260 の電気的特性と機能

A6260のメーカーはAllegro MicroSystemsです、この部品の機能は「High Brightness LED Current Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 A6260
部品説明 High Brightness LED Current Regulator
メーカ Allegro MicroSystems
ロゴ Allegro MicroSystems ロゴ 




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A6260 Datasheet, A6260 PDF,ピン配置, 機能
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A6260
High Brightness LED Current Regulator
Features and Benefits
Automotive grade
LED drive current up to 350 mA
6 to 40 V supply
Reverse battery protection
Low drop-out voltage
LED short circuit and thermal protection
10 μA maximum shutdown current
PWM dimming control input
Current slew rate limiting
Package: 8-pin SOIC with exposed
thermal pad (suffix LJ)
Not to scale
Description
The A6260 is a linear, programmable current regulator
providing up to 350 mA for driving high-brightness LEDs.
The LED current, accurate to 4%, is set by a single low-power
sense resistor. Driving LEDs with constant current ensures
safe operation with maximum possible light output.
For automotive applications, optimum performance is
achieved when driving between 1 and 3 LEDs at cur-
rents up to 350 mA.
The low dropout voltage of the A6260 allows a single white
LED to be driven safely, at full current, with a supply voltage
down to 6 V.
An enable input allows PWM dimming and can be used to
enable low-current sleep mode. The rate of change of current
during PWM switching is limited to reduce EMI.
Overcurrent detection is provided to protect the LEDs and
the A6260 during short-to-supply or short-to-ground at any
LED terminal.
The integrated temperature monitor can be used to reduce
the LED drive current if the chip temperature exceeds the
thermal limit.
The device is available in an 8-pin SOIC package with exposed
thermal pad (suffix LJ). The device is lead (Pb) free with 100%
matte-tin leadframe plating.
Typical Application
7 to 20 V
(–14 V min, 40 V max)
Automotive
12 V Power Net
PWM Dimming
and
On-Off Control
VIN
LA
EN
A6260
THTH
LC
LSS
SENSE
GND
6260-DS
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A6260 pdf, ピン配列
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A6260
High Brightness LED Current Regulator
VBATT
Functional Block Diagram
VIN
Reg
Current Limited
Switch
LA
EN
THTH
R TH
Control
Logic
Temp
Comp
Temp
Monitor
Reference
Generator
Slew
Limit
GND
Output
Monitor
Current
Regulator
LC
LSS
SENSE
RS
Pin-out Diagram
SENSE
GND
THTH
EN
1
2
3
4
8 LSS
7 LC
6 LA
5 VIN
Terminal List Table
Number
Name
1 SENSE
2 GND
3 THTH
4 EN
5 VIN
6 LA
7 LC
8 LSS
Description
Current sense input
Ground reference
Thermal threshold input
Enable input
Main supply
LED anode (+) connection
LED cathode (-) connection
Low-side sense connection
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
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A6260 電子部品, 半導体
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A6260
High Brightness LED Current Regulator
dedicated sense resistor, which determines its share of the current
provided to the LED.
LED Brightness
Although the LED brightness can be controlled by changing the
current (intensity) this may slightly affect the color or the color
temperature of the light from the LED. When multiple LEDs
are used, it is usually more desirable to control the brightness by
switching the fixed LED current with a pulse width modulated
signal. This allows the LED brightness to be set using a digital
control input with little effect on the LED color.
In the A6260, the brightness level can be controlled by a PWM
signal applied to the EN input. This controls both the low-side
linear regulator and the high-side switch.
When EN is switched from high to low, the low-side regulator
reduces the current to zero before allowing the high-side switch
to turn off.
When EN is switched from low to high, the high-side switch is
turned on before the low-side regulator increases the current to
the full operating level.
To assist EMC, the rate of change of the LED current is limited
and the current will rise and fall within the limits (tr, tf) defined in
the Electrical Characteristics table.
Note that EN can be used for PWM dimming even when the
high-side switch is bypassed. (See figure 4(d)).
Sleep Mode
When EN is held low, the A6260 will be in shutdown mode and
all internal circuits will be in a low-power sleep mode. In this
mode, the input current, IINS, will be less than 10 μA. This means
that the complete circuit, including LEDs, may remain connected
to the power supply under all conditions.
Safety Features
The circuit includes several features to ensure safe operation and
to protect the LEDs and the A6260:
The high-side switch between VIN and LA has overcurrent
detection and a current limiter. It assumes that a short circuit is
present if the current exceeds the trip value, ILAOC, for longer
than the overcurrent detection time, tOCD.
The current regulator between LC and LSS provides a natural
current limit due to the regulation.
The thermal monitor reduces the regulated current as the
temperature rises.
Thermal shutdown completely disables the outputs under
extreme overtemperature conditions.
Short Circuit Detection
A total of five short circuit conditions can exist as illustrated in
figure 1.
LA Short to Supply (figure 1a) This condition is permitted
because the current remains regulated by the current sink. This
configuration may also be used in applications with low supply
voltages (see figure 4d in the Applications Information section).
LA Short to Ground (figure 1b) This condition is detected when
the high-side switch current exceeds the trip value, ILAOC, for
longer than the overcurrent detection time, tOCD (3 μs typical).
When a short is detected, the switch and the regulator are both
disabled. When the voltage at LC drops below the short release
voltage, VSCCR, a low value current, ISCU (1.1 mA typical), is
then sourced from LA to provide a short circuit monitor. When
VIN
LA
A6260
LC
GND
VIN
LA
A6260
LC
GND
(a) LA Short to Supply
Permitted because
current remains
regulated
(b) LA Short to Ground
Detected when switch
current exceeds trip
value for longer than
3 μs, released when
VLC >VSCCR
Figure 1. Short circuit conditions detected
VIN
LA
A6260
LC
GND
(c) LC Short to Supply
Current remains
regulated, thermal
shutdown provides
protection
VIN
LA
A6260
LC
GND
(d) LC Short to Ground
Detected when switch
current exceeds trip
value for longer than
3 μs, released when
VLC >VSCCR
VIN
LA
A6260
LC
GND
(e) LA Short to LC
Current remains
regulated, thermal
shutdown provides
protection
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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共有リンク

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