t6309a TM Technology Inc., t6309a Datasheet
t6309a
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t6309a Summary of contents
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... LED). The OVP pin can monitor the output voltage and turn off the converter in the event of overvoltage condition. The T6309A is available in SOT- 23-6 packages T6309A Publication Date: MAY. 2007 ...
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... EMI. Ground pin. Connect to local ground plane. Feedback pin. Reference voltage is 400mV (T6309A-A). Optional reference voltage is 1.19V (T6309A-B). Connect cathode of lowest LED and current sense resistor here. Chip enable pin. Tie CE pin to 1.5V or higher to enable device; 0.4V or less to shutdown the device. Do not float this pin. ...
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... DS(on) I Current Limit LIM TM Technology Inc. reserves the right to change products or specifications without notice. = 25°C SOT-23-6 …………. 0.35W A Conditions T6309A-A T6309A-B ) FB=0.5V OUT ) CE= T6309A Min. Typ. Max Unit 2 340 400 460 mV 1.15 1.19 1.23 V 300 400 550 ...
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... T A=+25 ºC, unless otherwise noted.) IN OUT Io=20mA 0.43 0.42 0.41 0.4 0.39 0.38 4.0 4.5 5.0 Stability for driving 4LED / Vin=3.6V (time=1.0us/Div) Vout 1.0V /Div Vsw 5.0V/D iv (time=1.0us/Div T6309A VFB Temperature curve -30 -20 - Temperature (°C) (tim e=1.0us/D iv) Publication Date: MAY. 2007 Revision: A Vin=3.1V Load 4LED ...
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... TM Technology Inc. reserves the right to change products or specifications without notice. =4.7uF, C =4.7uF, T A=+25 ºC, unless otherwise noted.) IN OUT - Io=15mA VFB Temperature curve 0.43 0.42 0.41 0.4 0.39 4.0 4.5 5.0 0.38 Stability for driving 6LED/Vin=3.6V Vout Vsw P. 5 T6309A -30 -20 - Temperature (ºC) Publication Date: MAY. 2007 Vin=3.1V Load 6LED Revision: A ...
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... LED current regardless the input voltage and number of LEDs connected. With integrated overvoltage protection (OVP), the T6309A can be used as a current source with overvoltage protection to drive LEDs. This allows LEDS to be connected in series to the output. The low 400mV feedback reference voltage reduces power loss and improves efficiency ...
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... More details are in the dimming control section Undervoltage Lockout An undervoltage lockout (UVLO) circuit prevents fault operation of the T6309A when input voltage is under 1.75V (typ). The device remains off as long as the input voltage is under the UVLO threshold. TM Technology Inc. reserves the right to change products or specifications without notice ...
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... There are several types of dimming control circuit as follows: 1. Using a PWM signal to CE pin When using a PWM signal at CE pin, the T6309A is turned on or off by the PWM signal. The average LED current increases proportionally with the duty cycle of the PWM signal. The typical frequency range of the PWM signal is 150Hz to 250Hz ...
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... Inductor Selection R 1 The T6309A is designed to work well with a 10uH inductor in most applications. Low inductance values supply higher output current, but also increase the ripple and reduce efficiency. Higher inductor values reduce ripple and improve efficiency, but also limit output current ...
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... In addition, the ground connection for the sense resistor Rs should be tied directly to the GND pin and not shared with any other component. This ensures a clean, noise-free connection. the following P. 10 T6309A Publication Date: MAY. 2007 Revision: A ...
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... C ontrol . Publication Date: MAY. 2007 T6309A Revision: A ...
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... C ontrol . Publication Date: MAY. 2007 T6309A Revision: A ...
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... Dimension in inch Max. Min. Typ. 3.00 0.102 0.110 1.60 0.055 0.062 3.00 0.106 0.112 0.075(BSC) 0.037(BSC) 1.45 0.037 0.047 1.30 0.035 0.043 0.150 0 0.003 0.015 0.60 0.012 0.018 0.22 0.003 0.006 0~8° 5~15° T6309A F E Max. 0.118 0.063 0.118 0.057 0.051 0.06 0.023 0.009 Publication Date: MAY. 2007 Revision: A ...