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부품번호 | A6213 기능 |
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기능 | Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver | ||
제조업체 | Allegro | ||
로고 | |||
전체 17 페이지수
A6213
Automotive Grade, Constant-Current 3-Ampere
PWM Dimmable Buck Regulator LED Driver
Features and Benefits
• AEC-Q100 qualified
• 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 A6213 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:
Automotive lighting
• Daytime running lights
• Front and rear fog lights
• Turn/stop lights
• Map light
• Dimmable interior lights
Typical Application Circuit
VIN (6 to 48 V)
GND C1
EN
R1
Enable/PWM Dimming
(100 Hz to 2 kHz)
1
2
VIN
TON
A6213 SW
BOOT
8
7
3 EN
GND 6
4 CS
VCC 5
C4
C5
L1
D1
LED+
LED–
RSENSE
Two different methods of achieving PWM dimming of LED current are shown
A6213-DS
A6213
Automotive Grade, Constant-Current 3-Ampere
PWM Dimmable Buck Regulator LED Driver
ELECTRICAL CHARACTERISTICS Valid at VIN = 24 V, TA = –40°C to 125°C, typical values at TA = 25°C; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
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
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 V
– 5.3 –
V
– 150 – mV
– 5 – mA
– 1 10 μA
3.0 4.0 5.0
A
– 0.25 0.4
Ω
1.7 2.9 4.3
V
– 370 – mV
–
110 150
ns
–
110 150
ns
800
1000
1200
ns
Load Current Sense Regulation
Threshold
VCSREG VCS decreasing, SW turns on
187.5
200
210
mV
Load Current Sense Bias Current
Internal Linear Regulator
ICSBIAS VCS = 0.2 V, EN = low
– 0.9 – μA
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
V
5 20 – mA
Logic High Voltage
VIH VEN increasing
1.8 – – V
Logic Low Voltage
VIL VEN decreasing
– – 0.4 V
EN Pin Pull-down Resistance
RENPD VEN = 5 V
– 100 –
kΩ
Measured while EN = low, during dimming
Maximum PWM Dimming Off-Time
tPWML control, and internal references are powered-on
10
17
–
ms
(exceeding tPWML results in shutdown)
Thermal Shutdown
Thermal Shutdown Threshold
TSD
Thermal Shutdown Hysteresis
TSDHYS
*The internal linear regulator is not designed to drive an external load
– 165 –
– 25 –
°C
°C
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
4페이지 A6213
Automotive Grade, 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
7
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다운로드 | [ A6213.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |