aoz1950 Alpha & Omega Semiconductor, aoz1950 Datasheet
aoz1950
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aoz1950 Summary of contents
Page 1
... Input voltage short circuit protection switch, open-LED over-voltage protection, input under-voltage lockout, thermal shutdown and soft-start. The AOZ1950 is available in a tiny 3mm x 3mm 10-pin DFN package and is rated over a -40°C to +85°C operating temperature range. Typical Application VIN 2 ...
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... Controller Ground. Rev. 1.0 January 2010 Package DFN-10 for additional information. AOZ1950DI PGND LX 1 PAD1 10 (LX) IND VIN AGND 3 8 PAD2 VOUT DIM 4 7 (AGND) FB COMP 5 6 3x3 DFN-10 (Top View) Description www.aosmd.com AOZ1950 Environmental Green Product RoHS Compliant Page ...
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... Condition VIN rising EN = VIN EN = GND EN = VIN FB = 250mV VIN = 4.2V, VOUT = 30V Number of LEDs = VIN 500mA NMOS EN = GND 60V EN = VIN 500mA PMOS VOUT Rising Temperature Rising Enable Rising www.aosmd.com AOZ1950 Rating ) 2. -40°C to +85°C A 40°C/W ) Min. Typ. Max. Units 2.7 5.5 V 2.6 V 200 mV 1 ...
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... Comp Dimming DIM Detect Enable PWM Dimming EN Detect AOZ1950 Rev. 1.0 January 2010 VOUT VIN Output Input Over Voltage UVLO Logic Driver Controller Over Current Isense EA Amp Soft Start AGND Figure 1. Functional Block Diagram www.aosmd.com AOZ1950 IND LX LED PGND FB COMP Page ...
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... Functional Description AOZ1950 is a constant off time boost converter that is ideal for white LED backlight applications. The operating input voltage range is from 2.7V to 5.5V and can support series LED’s, with the maximum allowed output voltage set at 53V. The LED current is set by a series feedback resistor, located at the bottom of the LED string ...
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... Rev. 1.0 January 2010 For example , if the output LED current is set to 30mA at 100% duty ratio, it will be about 3mA with a duty ratio of 10%. AOZ1950 provides an extremely linear relationship between 10% to 100% (Figure 5). To accommodate both PWM both dimming and EN functions with the same pin, a delay disable of 4 ...
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... LEDs IN Figure 9. Steady State Waveforms V = 5.5V 22μH, 12 LEDs IN Figure 11. Output Short to GND Protection Rev. 1.0 January 2010 V = 5.5V, 6 LEDs IN Figure 8. Startup Switching Waveforms V = 5.5V, 6 LEDs IN Figure 10. Steady State Waveforms V = 5.5V 22μH, 12 LEDs IN Figure 12. Current Limit Off Pulse www.aosmd.com AOZ1950 5mS/div Page ...
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... PWM Signal 5/div 500μS/div = 1kHz, PWM Duty = 50% PWM ILED Current 100mA/div IL Current (500mA/div) LX 50V/div PWM Signal 5/div 500μS/div = 1kHz, PWM Duty = 90% PWM ILED Current 100mA/div IL Current (500mA/div) LX 50V/div PWM Signal 5/div 500μS/div www.aosmd.com AOZ1950 Page ...
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... Input Capacitor The input capacitor is connected to VIN and GND pins of the AOZ1950 to filter and maintain a steady input DC voltage. The voltage rating of input capacitor must be greater than maximum input voltage plus ripple voltage. The RMS current rating should be greater than the inductor ripple current: The input capacitor value should be 4 ...
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... NMOS device. During this interval, the output boost diode is reversed biased with its anode pulled low to ground. Since the NMOS is internal in the AOZ1950 much of the parasitic inductance is made from the power return to the ground connection of the input capacitors. ...
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... COMP C C DIM Figure 14. Example of AOZ1950 PCB Layout and DFN-10 Pin-out Below are some key tips in minimize the two main switching loops and improving noise immunity 1. Maximized the copper area to the GND pin and the VIN pin for improved thermal dissipation. ...
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... D2 E 3.00 BSC 1.55 1.70 E1 0.27 e 0.50 BSC L 0.28 0.38 0.27 L1 0.47 0.57 L2 0.07 0.17 L3 0.27 REF. 0.15 REF R aaa 0.15 bbb 0.10 ccc 0.10 Unit: mm ddd 0.08 www.aosmd.com AOZ1950 E1 BOTTOM VIEW Dimensions in inches Symbols Max. Min. Nom. Max. 1.00 0.031 0.035 0.039 A A1 0.05 0.000 0.001 0.002 0.008 REF A3 0.33 0.008 0.009 0.013 ...
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... 1.50 1.50 12.00 1.75 5.50 +0.10 +0.10 ±0.10 ±0.05 ±0. ø97.00 13.00 17.40 ø13.00 ±0.10 ±0.30 ±1.00 +0.50 / -0.20 Components Tape Orientation in Pocket www.aosmd.com AOZ1950 Feeding Direction 8.00 4.00 2.00 0.30 ±0.10 ±0.10 ±0.05 ±0. 10.60 2. ±0.50 Leader Tape 500mm min. ...
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... W) Assembly Location Assembly Lot Number 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. www.aosmd.com AOZ1950 Page ...