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AP3102M-G1 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AP3102M-G1 Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 14 page AP3102/V/L Document number: DS37419 Rev.2 - 2 10 of 14 www.diodes.com July 2014 © Diodes Incorporated AP3102/V/L A Product Line of Diodes Incorporated Operation Description (Cont.) The VADJ threshold is adjustable by changing the external resistor connected from pin ADJ to the ground. Adjusting the VADJ voltage can optimize the standby power and audible noise for most applications. Another function of ADJ pin is to use it as the latch trigger input. When the voltage at this pin is more than 4.5V, the system will be latched by limiting the VCC to a lower voltage. If the IC is started from bulk capacitor through resistor, the system will be latched until the bulk voltage decreases to a very low value just like unplugged the AC input. Then, the IC latch current can't be maintained and latch will be released (see description below). This function can be used as system OTP and other protection. System Protection and Pin Fault Protection AP3102/V/L provides versatile system and pin fault protections. The OCP comparator realizes the cycle-by-cycle current limiting (OCP). Cooperating with BOK compensation from the input line voltage, the IC realizes the constant over load protection (OLP). VCC over voltage protection can be applied as the primary OVP or opto-coupler broken protection. The AP3102/V/L also has pin fault connection protection including floating and short connection. The floating pin protection includes the RI, SENSE, FB, etc; the short pin protection includes the RI pin short protection. When these pins are floated or RI pin is shorted to ground, PWM switching will be disabled, thus protect the power system. Below figures show the relative timing sequences of system protections. VBOK Gate drive UVLO 4V VCC 0.5V 35mS VFB 35mS 4.2V Line OVP & Brown-Out Output Short Vo VCC OVP (AP3102) 25 S 28V VADJ Gate drive Latch until unplug AC UVLO VCC >25 S 4V De-latch Point Auto Recoverable Protection Mode Latch Protection Mode VADJ VFB 35mS 4.2V Vo Latch through ADJ Pin Output Short (AP3102L) VCC OVP (AP3102V, AP3102L) 25 S 28V UVLO 25 S Typical Timing Sequences of AP3102/V/L Protections |
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