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부품번호 A6217-1 기능
기능 PWM Dimmable Buck Regulator LED Driver
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A6217-1 데이터시트, 핀배열, 회로
A6217 and A6217-1
Automotive-Grade, Constant-Current
PWM Dimmable Buck Regulator LED Driver
FEATURES AND BENEFITS
• AEC-Q100 qualified
• 6 to 48 V supply voltage
• True average output current control
• 3 A maximum output over operating temperature range
(1.5 A for A6217-1)
• Cycle-by-cycle current limit
• Integrated MOSFET switch
• Enable / PWM 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
• Enhancements over A6213:
▫ Dithering of switching frequency to reduce EMI
▫ Able to drive single white LED from 18 V supply at 2.2 MHz
▫ Smaller package option
PACKAGES:
10-pin DFN with
wettable flank
(suffix EJ)
Not to scale
8-pin SOICN
(suffix LJ)
DESCRIPTION
The A6217 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 3 mm × 3 mm wettable flank 10-pin
DFN (suffix EJ) or an 8-pin narrow SOIC (suffix LJ), both with
exposed pad for enhanced thermal dissipation. Both packages
are 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
VIN (6 to 48 V)
TYPICAL APPLICATION CIRCUIT
GND C1
EN
1, 2
R1 3
VIN
TON
A6217
(EJ)
SW
BOOT
9,10
8 C4
4 EN
5 CS
PAD GND 7
VCC 6
Enable/PWM Dimming
(100 Hz to 2 kHz)
C5
L1
D1
LED+
LED
RSENSE
A6217-DS




A6217-1 pdf, 반도체, 판매, 대치품
A6217 and
A6217-1
Automotive-Grade, Constant-Current
PWM Dimmable Buck Regulator LED Driver
ELECTRICAL CHARACTERISTICS: Valid at VIN = 12 V, TJ = –40°C to 125°C, typical values at TJ = 25°C, unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Input Supply Voltage
VIN
6 – 48 V
VIN Undervoltage Lockout Threshold
VUVLO
VIN increasing
– 5.3 –
V
VIN Undervoltage Lockout Hysteresis
VUVLO_HYS VIN decreasing
– 150 – mV
VIN Pin Supply Current
IIN VCS = 0.5 V, EN = High
– 2.5 – mA
VIN Pin Standby Current
IINSB
VCS = 0.5 V, EN = high to low, within 10 ms
1
– mA
VIN Pin Shutdown Current
IINSD
EN shorted to GND
– 1 10 µA
Buck Switch Current Limit Threshold
ISWLIM
A6217
A6217-1
3.0 4.0 5.0
1.9 2.2 2.7
A
A
Buck Switch On-Resistance
RDS(on) VBOOT = VIN + 4.3 V, TA = 25°C, ISW = 1 A
– 0.25 0.4
Ω
 BOOT Undervoltage Lockout Threshold VBOOTUV VBOOT to VSW increasing
2.7 3.5 4.3
V
 BOOT Undervoltage Lockout Hysteresis VBOTUVHYS VBOOT to VSW decreasing
– 370 – mV
Switching Minimum Off-Time
tOFFmin
VCS = 0 V
110 150
ns
Switching Minimum On-Time
tONmin
– 75 100 ns
Selected On-Time
tON VIN = 12 V, VOUT = 6 V, RON = 31.6 kΩ
200 250 300
ns
Oscillator Frequency Dithering Range
fSW_DITH RON = 31.6 kΩ
– ±5 – %
Dithering Modulation Frequency
fSW_MOD RON = 31.6 kΩ
– 11 – kHz
REGULATION COMPARATOR AND ERROR AMPLIFIER
Load Current Sense Regulation
Threshold [1]
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 [2]
ENABLE INPUT
VCC
ICCLIM
0 mA < ICC < 5 mA, VIN > 6 V
VCC = 0 V
5.1 5.4 5.7
V
5 20 – mA
Logic High Voltage
Logic Low Voltage
EN Pin Pull-Down Resistance
Maximum PWM Dimming Off-Time
THERMAL SHUTDOWN
VIH VEN increasing
1.8 – – V
VIL VEN decreasing
– – 0.4 V
RENPD
VEN = 5 V
– 100 –
Measured while EN = low, during dimming
tPWML
control, and internal references are
powered on
12 20 – ms
(exceeding tPWML results in shutdown)
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
TSD
TSDHYS
– 165 –
– 25 –
°C
°C
1 In test mode, a ramp signal is applied at CS pin to determine the CS pin regulation threshold voltage. In actual application, the average CS pin
voltage is regulated at VCSREG regardless of ripple voltage.
2 The internal linear regulator is not designed to drive an external load
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4

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A6217-1 전자부품, 판매, 대치품
A6217 and
A6217-1
Automotive-Grade, Constant-Current
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
0.001
0.1
VIN = 24 V, load = 2× LED
VIN = 12 V, load = 1× LED
VIN = 12 V, load = 2× LED
Ideal
1 10
PWM Dimming Duty Cycle (%)
100
Figure 5. Average LED Current versus PWM dimming percentage
Operating conditions: VIN = 12 or 24 V, VOUT = 3.7 V (1× LED) or 7 V (2× LED),
iLED = 1.5 A, RON = 73.2 kΩ, fSW = 1 MHz, L = 15 µH
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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A6217-1

PWM Dimmable Buck Regulator LED Driver

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