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A6211 데이터시트 PDF




Allegro에서 제조한 전자 부품 A6211은 전자 산업 및 응용 분야에서
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부품번호 A6211 기능
기능 Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver
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A6211 데이터시트, 핀배열, 회로
A6211
Constant-Current 3-Ampere PWM Dimmable
Buck Regulator LED Driver
Features and Benefits
• Supply voltage 6 to 48 V
• True average output current control
• 3.0 A maximum output over operating temperature range
• Cycle-by-cycle current limit
• Integrated MOSFET switch
• Dimming via direct logic input or power supply voltage
• Internal control loop compensation
• Undervoltage lockout (UVLO) and thermal shutdown
protection
• Low power shutdown (1 μA typical)
• Robust protection against:
Adjacent pin-to-pin short
Pin-to-GND short
Component open/short faults
Package 8-pin SOICN with exposed
thermal pad (suffix LJ):
Not to scale
Description
The A6211 is a single IC switching regulator that provides
constant-current output to drive high-power LEDs. It integrates
a high-side N-channel DMOS switch for DC-to-DC step- down
(buck) conversion. A true average current is output using a
cycle-by-cycle, controlled on-time method.
Output current is user-selectable by an external current sense
resistor. Output voltage is automatically adjusted to drive
various numbers of LEDs in a single string. This ensures the
optimal system efficiency.
LED dimming is accomplished by a direct logic input pulse
width modulation (PWM) signal at the enable pin.
The device is provided in a compact 8-pin narrow SOIC package
(suffix LJ) with exposed pad for enhanced thermal dissipation.
It is lead (Pb) free, with 100% matte tin leadframe plating.
Applications:
• General Illumination
• Scanners and multi-function printers (light bars)
• Architectural lighting
• Industrial Lighting
• Display case lighting / MR16
Typical Application Circuit
VIN (6 to 48 V)
GND C1
EN
R1
Enable/PWM Dimming
(100 Hz to 2 kHz)
1 VIN
2 TON
3 EN
4 CS
A6211 SW
BOOT
8
7
GND 6
VCC 5
C4
C5
L1
D1
LED+
LED
RSENSE
A6211-DS




A6211 pdf, 반도체, 판매, 대치품
A6211
Constant-Current 3-Ampere PWM Dimmable
Buck Regulator LED Driver
ELECTRICAL CHARACTERISTICS Valid at VIN = 24 V, for TA = –40°C to 105°C, typical values at TA = 25°C; unless
otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Input Supply Voltage
VIN
VIN Undervoltage Lockout Threshold
VUVLO
VIN Undervoltage Lockout Hysteresis VUVLO_HYS
VIN Pin Supply Current
IIN
VIN Pin Shutdown Current
IINSD
BOOT Switch Current Limit Threshold ISWLIM
Buck Switch On-Resistance
RDS(on)
BOOT Undervoltage Lockout Threshold VBOOTUV
BOOT Undervoltage Lockout Hysteresis VBOTUVHYS
Switching Minimum Off-Time
tOFFmin
Switching Minimum On-TIme
tONmin
Selected On-Time
tON
Regulation Comparator and Error Amplifier
TA = 25°C
VIN increasing
VIN decreasing
VCS = 0.5 V, EN = high
EN shorted to GND
VBOOT = VIN + 4.3 V, TA = 25°C, ISW = 1 A
VBOOT to VSW increasing
VBOOT to VSW decreasing
VCS = 0 V
VIN = 24 V, VOUT = 12 V, RON = 137 kΩ
6 – 48
– 5.3 –
– 150 –
–5–
– 1 10
3.0 4.0 5.0
– 0.25 0.4
1.7 2.9 4.3
– 370 –
– 110 150
– 110 150
800
1000
1200
Load Current Sense Regulation
Threshold
VCSREG VCS decreasing, SW turns on
187.5
200
210
Load Current Sense Bias Current
Internal Linear Regulator
ICSBIAS VCS = 0.2 V, EN = low
– 0.9 –
VCC Regulated Output
VCC Current Limit*
Enable Input
VCC
ICCLIM
0 mA < ICC < 5 mA, VIN > 6 V
VIN = 24 V, VCC = 0 V
5.0 5.3 5.6
5 20 –
Logic High Voltage
VIH VEN increasing
1.8 –
Logic Low Voltage
VIL VEN decreasing
– – 0.4
EN Pin Pull-down Resistance
RENPD VEN = 5 V
– 100 –
Maximum PWM Dimming Off-Time
tPWML
Measured while EN = low, during dimming
control, and internal references are powered-on
(exceeding tPWML results in shutdown)
10
17
Thermal Shutdown
Thermal Shutdown Threshold
TSD
Thermal Shutdown Hysteresis
TSDHYS
*The internal linear regulator is not designed to drive an external load
– 165 –
– 25 –
Unit
V
V
mV
mA
μA
A
Ω
V
mV
ns
ns
ns
mV
μA
V
mA
V
V
kΩ
ms
°C
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A6211 전자부품, 판매, 대치품
A6211
Constant-Current 3-Ampere PWM Dimmable
Buck Regulator LED Driver
95
VIN = 24 V, VOUT = 15 V
90
VIN = 12 V, VOUT = 5.5 V
85
VIN = 12 V, VOUT = 3.5 V
80
75
70
0
0.5 1.0 1.5 2.0 2.5 3.0
LED Current, iLED (A)
Figure 3. Efficiency versus LED Current at various LED voltages
Operating conditions: fSW = 1 MHz
95
fSW = 500 kHz
90
85
80
fSW = 1 MHz
fSW = 2 MHz
75
70
0
0.5 1.0 1.5 2.0 2.5 3.0
LED Current, iLED (A)
Figure 4. Efficiency versus LED Current at various switching frequencies
Operating conditions: VIN = 12 V, VOUT = 5.5 V
1
0.1
0.01
iLED = 3 A
iLED = 2 A
iLED = 1.4 A
0.001
0.1
1 10
Duty Cycle (%)
100
Figure 5. Average LED Current versus PWM dimming percentage
Operating conditions: VIN = 12 V, VOUT = 3.5 V, fSW = 1 MHz, fPWM = 200 Hz, L = 10 μH
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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