A8513 ALLEGRO [Allegro MicroSystems], A8513 Datasheet
A8513
Related parts for A8513
A8513 Summary of contents
Page 1
... The A8513 is provided in a 10-pin MSOP package (suffix LY) and a 16-pin TSSOP package (suffix LP). Both packages have an exposed thermal pad for enhanced thermal dissipation, and are lead (Pb) free, with 100% matte tin leadframe plating ...
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... Oscillator Frequency, f Part Number (MHz) A8513KLYTR-T 2 A8513KLYTR-1-T 1 A8513KLYTR-2-T 0.5 A8513KLYTR-3-T 0.25 A8513KLPTR-T 2 A8513KLPTR-1-T 1 A8513KLPTR-2-T 0.5 A8513KLPTR-3-T 0.25 ® *Contact Allegro for additional packing options Absolute Maximum Ratings* Characteristic LED Pin OVP Pin VIN and ¯ F ¯ ¯ A ¯ ¯ ¯ U ¯ ¯ L ¯ ¯ T ¯ Pins ...
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... NC Output of the error amplifier and compensation node. Connect compensation network from this pin to GND for control loop compensation. This pin is used to indicate fault conditions. Logic low indicates that the A8513 has a fault present. Ground. Connect the R resistor between this pin and GND to set the 100% LED current level. ...
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... A8513 VIN COMP EN/PWM 100 kΩ Internal V ISET Wide Input Voltage Range, High Efficiency Functional Block Diagram VDD Internal Regulator 1.235 V REF UVLO Ref Enable Internal V CC ∑ + Driver Oscillator Circuit – + Internal – Current Soft Start I Sense SS Thermal Shutdown ...
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... I SWlkg EN/PWM = SW(LIM) Higher than I (max) in all conditions, SW(LIM) I SW(LIM2) A8513 latches when detected t SW(ON) t SW(OFF) Fault Tolerant LED Driver = 25ºC; unless otherwise specified A Min. Typ. 4.5 − − − − − − ...
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... Measured while EN/PWM = low during dimming control, and internal references t PWML are powered-on (exceeding t PWML shutdown) t First cycle when powering-up A8513 PWMH Time between PWM enable and when LED current reaches 90% of maximum; dPWM(on → PWM Time between PWM enable going low ...
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... A8513 VIN Input Sleep Mode Current versus Ambient Temperature - Temperature (°C) VIN UVLO Rising Threshold Voltage versus Ambient Temperature 4.345 4.295 4.245 4.195 4.145 4.095 4.045 3.995 3.945 - Temperature (°C) Efficiency Versus Input Voltage ...
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... A8513 100 10 1 0.1 0.10 0.01 LED Current versus Ambient Temperature I = 150 μA LED 151.0 150.8 150.6 150.4 150.2 150.0 149.8 149.6 - Temperature (°C) Wide Input Voltage Range, High Efficiency Normalized LED Current Ratio versus PWM Duty Cycle ≈ 200 Hz series LEDs ( ...
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... Powering up: LED pin short to GND check After the VIN pin goes above V UVLOrise pin is shorted to GND by pre-charging the LED pin (figure 3). When the voltage on the LED pin exceeds 260 mV, the A8513 proceeds with soft start short is present on the LED pin, the V OUT ...
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... The LED current can be reduced from the 100% current level by PWM dimming using the EN/PWM pin. When the EN/PWM pin is pulled high, the A8513 turns on and the LED pin sinks 100% current (figure 4). When EN/PWM is pulled low, the boost con- verter and LED sink are turned off. The compensation (COMP) pin is floated, and critical internal circuits are kept active ...
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... DAC ▫ V < 1.003 V; the LED current is increased DAC Output Overvoltage Protection (OVP) and Output Undervoltage Protection (UVP) The A8513 has output overvoltage protection (OVP), output undervoltage protection and secondary overvoltage protection (open diode). (3) Overvoltage Protection is the DAC out- of 1.218 V. A resistive divider can be used to set the V DAC voltage protection threshold (see figure 8) ...
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... The A8513 starts boosting the output voltage (ch1, 20 V/div.). (C) Upon reaching the OVP threshold there is still no current flow through the LED pin, and the A8513 shuts down and sets the fault flag (ch2, 5 V/div.). The LED pin voltage is ch4, 2 V/div. (time = 50 μs/div.) ...
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... Figure 14. Secondary Overvoltage protection tripped when the switching diode is opened during operation. (A) High voltage is detected on SW node (ch1, 20 V/div.) and the A8513 is shut down. (B) Fault flag is set (ch2, 5 V/div.). Shows LED current (ch3, 100 mA/div.), time = 500 ns/div. Wide Input Voltage Range, High Efficiency ...
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... If the EN/PWM pin is pulled low for more than t UVLOrise device enters shutdown mode and clears all internal fault regis- for more than 1 μs ters. In shutdown, the A8513 will disable all current sources and wait until EN/PWM goes high to re-enable the IC ...
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... A8513 Fault protection during operation The A8513 constantly monitors the state of the system to deter- mine if any fault conditions occur. The response to a triggered fault condition is summarized in the table below. Note: Some of the protection features might not be active during startup, to prevent false triggering of fault conditions. ...
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... A8513 ISET Short to Ground FAULT LED C3 ISET C4 t Figure 18. ¯ F ¯ ¯ A ¯ ¯ ¯ U ¯ ¯ L ¯ ¯ T ¯ (ch1, 5 V/div.), V (ch2, 20 V/div.), I SW 100 mA/div.), and ISET (ch4, 1 V/div.), time = 1 μs/div Figure 20 V/div.), ¯ F ¯ ¯ A ¯ ¯ ¯ U ¯ ¯ L ¯ ¯ T ¯ (ch4, 5 V/div.), time = 2 ms/div. ...
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... The Theoretical Maximum V (7) V OUT where V The Theoretical Maximum V value V OUT(OVP) sion of the A8513 should be chosen to meet the maximum duty cycle requirements. Step 4: Inductor selection. The inductor should be chosen such + (8) that it can handle the necessary input current. In most applica- f ...
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... A8513 Step 4a: Determine the Duty Cycle: (min – = D(max OUT(OVP – = 22. 0.4 V where V is the voltage drop of the boost diode. d Step 4b: Determine the maximum and minimum input current to the system. The minimum input current will dictate the inductor value ...
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... A8513 For a stable system, the required minimum slope must be smaller than the IC slope compensation. Note: The slope compensation value is in A/μs; the 1×10 constant multiplier. STEP 4e: Determine the inductor current rating : I minimum rating = I (max 0.595 0.695 A Step 5: Choose the proper switching diode. The switching diode should be chosen for three characteristics when it is used in LED lighting circuitry ...
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... The rms current through the capacitor is given by: (26) 0.25 μF A good ceramic input capacitor with ratings of 2.2 μF, 50V or 4.7 μ will suffice for this application. Corresponding capacitors include: Vendor Murata Murata L1 10 μ VIN A8513 OVP C VDD VDD 0.1 μF PAD FAULT EN/PWM LED ISET COMP R ISET ...
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... A8513 VIN VDD C VDD PAD R7 FAULT EN/PWM ISET R ISET GND VIN A8513 V C OVP VDD C VDD PAD FAULT EN/PWM LED ISET COMP R ISET GND Fault Tolerant LED Driver VOUT D1 R OVP1 C OUT OVP R OVP2 LED ...
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... A8513 5.00±0. NOM 16X 0.10 C 0.30 0.19 0.65 BSC Wide Input Voltage Range, High Efficiency Package LP, 16-Pin TSSOP with Exposed Thermal Pad B 3 NOM 4.40±0.10 6.40±0.20 Branded Face C SEATING PLANE For Reference Only; not for tooling use (reference MO-153 ABT) 1.20 MAX Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions 0 ...
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... A8513 3.00 ±0. 1. 0.27 0.50 0.18 REF Wide Input Voltage Range, High Efficiency Package LY, 10-Pin MSOP with Exposed Thermal Pad 0° to 6° 0.15 ±0.05 3.00 ±0.10 4.88 ±0.20 0.53 ±0.10 0.25 Seating Plane Gauge Plane For Reference Only; not for tooling use (reference JEDEC MO-187BA-T) Dimensions in millimeters 1 ...
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... A8513 Revision History Revision Rev. 2 Copyright ©2011-2012, Allegro MicroSystems, Inc. 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. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’ ...