A6210 ALLEGRO [Allegro MicroSystems], A6210 Datasheet
A6210
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A6210 Summary of contents
Page 1
... Rev MHz Buck-Regulating LED Driver Description The A6210 is a buck regulator that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output LED span voltages ...
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... A6210 Selection Guide Part Number Packing A6210GEUTR-T 1500 pieces per reel Absolute Maximum Ratings (reference to GND) Characteristic VIN Pin Supply Voltage LX Pin Switching Node Voltage ISEN Pin Current Sense Voltage DIS Pin Disable Voltage TON Pin On-Time Voltage Operating Ambient Temperature ...
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... A6210 1.0 μF R1 180 kΩ TON DIS Switch Closed = On VIN UVLO Linear OK TSD Switching Frequency = 1.4 MHz All capacitors are X5R or X7R ceramic Resistor R2 should be surface mount, low inductance type, rated at 250 mW at 70°C Pin-out Diagram VIN BOOT ...
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... A6210 ELECTRICAL CHARACTERISTICS Characteristic General V Quiescent Current IN Current Sense Voltage On-Time Tolerance Minimum On-Time Period Minimum Off-Time Period Start-Up Time Buck Switch On-Resistance Input DIS Input Voltage Threshold DIS Open-Circuit Voltage DIS Input Current Protection VIN Undervoltage Shutdown Threshold VIN Undervoltage Shutdown Hysteresis ...
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... LED voltage. Each LED is assumed to have a voltage drop of 3.5 V. High Brightness LED Driving The A6210 can be configured as a very simple, low cost, high brightness LED driver. The solution can drive high brightness LEDs up to more than 3 A, while achieving very high efficien- cies, in excess of 90% ...
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... A6210 of physically small, low value inductors. An output capacitor is not necessary either to reduce the ripple current or to close the control loop. High efficiencies are achieved via drive circuits optimized to minimize switching losses and the current sense voltage has a typical voltage drop of only 183 mV. The current in the LED string can be pulse width modulated (PWM) via the DIS (Dis- able/Enable) pin ...
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... A6210 off-time of 350 ns. A minimum off-time is required to ensure the bootstrap supply operates correctly. It can be shown that: 1 – (min) off where t is 350 ns maximum. off Therefore: 1 – 0. –9 350 × 10 The t resistor (R1) value can be found × 2.051 × 10 ...
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... A6210 Figure 3. Switching voltage versus current through L1 and LED string I LED V LX Ch1 Ch2 t (A) Figure 4. PWM on DIS pin at 400 Hz: (A) narrow duty cycle, (B) wide duty cycle MHz Buck-Regulating LED Driver I LED V LX Ch1 Ch2 t Symbol Parameter Units/Division Ch1 ...
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... A6210 BOOT VIN C1 1.0 μ 6210 910 kΩ 910 kΩ ISEN TON PWM or Switch DIS SGND NC GND Channel 1 – Current through inductor and LED Assembly, Channel 2 – Main switching voltage (LX node) Plot 1. Average current = 1.34 A Plot 3. PWM frequency = 10 kHz, maximum duty cycle Plot 5 ...
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... A6210 BOOT VIN C1 1.0 μ 6210 310 kΩ ISEN TON PWM or Switch DIS SGND NC GND Channel 1 – Current through inductor and LED Assembly, Channel 2 – Main switching voltage (LX node) Plot 1. Average current = 2.4 A Plot 3. PWM frequency = 10 kHz, maximum duty cycle Plot 5 ...
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... A6210 4.00 ±0. 17X 0.08 C 0.30 ±0.05 0.65 0.40 ±0. 2.70 Copyright ©2008-2009, Allegro MicroSystems, Inc. The products described here are manufactured under one or more U.S. patents or U.S. patents pending. 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 per for mance, reliability, or manufacturability of its products ...