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LNK6XX5E Datasheet(PDF) 5 Page - Power Integrations, Inc. |
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LNK6XX5E Datasheet(HTML) 5 Page - Power Integrations, Inc. |
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5 / 24 page  Rev. C 03/14 5 www.powerint.com LinkSwitch-HP Remote On/Off and Fast AC Reset The PROGRAM pin can be used to turn on/off the device remotely. If the voltage on the pin is set to 1.35 V externally, the device stops switching. After releasing the PROGRAM pin the PROGRAM pin device commences switching when the voltage drops below 0.535 V. The PROGRAM pin can also be used to reset the device latch after a latching OVP or OTP event. If the voltage on the pin is set to 3.4 V externally, the device latch is reset. Once the voltage drops below 0.535 V, device will start switching. High-Voltage Bus Sensing LinkSwitch-HP senses indirectly the HV voltage bus V BUS during the power MOSFET on-time by monitoring the current flowing out of the FEEDBACK pin. During the MOSFET on-time the voltage across the auxiliary winding is proportional to the voltage across the input winding. The current flowing through resistor R FB1 (see Figure 8) is therefore representing VBUS. Indirect line sensing minimizes power dissipation and is used for line UV or line OV protection and current limit compensation over line. At power-up the current out of the FEEDBACK pin has to exceed the line undervoltage turn-on threshold (brown-in) current I FB(UVREF) = -250 mA (typ.) before switching is enabled. During normal operation switching is disabled if the FEEDBACK pin current falls below the line undervoltage turn-off threshold (brown-out) current I FB(UVOFF) = -100 mA (typ.) for at least 8 consecutive switching cycles. After switching has ended, the device enters auto-restart. The applicable auto-restart off- period t AR(OFF) 1 = 150 ms (typ.). Switching is also stopped if the FEEDBACK pin current exceeds the line overvoltage threshold current I FB(OV) = -1.15 mA (typ.) for at least 2 consecutive switching cycles. Current Limit Compensation Over Line The high-voltage bus is sensed by means of measuring the current out of the FEEDBACK pin during the MOSFET on-time. To limit available overload power over line the set current limit is compensated as shown in Figure 7. The compensation is disabled at peak currents below 50% of the set current limit, and is re-enabled at 62.5% of the set current limit. Soft-Start A digital soft-start is implemented to reduce component stress at power supply start-up. The internal reference voltage will ramp up to 2 V during t SOFT (typ. 15 ms) at start-up. The loop will typically close (output reaches regulation) during this time to ensure smooth output voltage rise. Fault Filter This is the digital filter to handle all the fault conditions including line overvoltage, line undervoltage, output overvoltage, and output undervoltage, thermal shutdown as well as package level fault (pin open-circuit or pin to pin short-circuit). Transconductance Amplifier The controller uses a high gain (typ. 70 dB) transconductance amplifier to ensure exceptional output regulation. Figure 7. Current Limit Compensation Over Line. Figure 8. Indirect High-Voltage Bus Sensing. Figure 6. Optional Shutdown Time Extension Programming. 0 50 100 150 200 250 300 350 400 450 500 110 100 PROGRAM Pin Capacitor Value (nF) 124 k Ω PROGRAM Pin Resistor Value 78.7 k Ω 52.3 k Ω 34.8 k Ω 23.2 k Ω 10.0 k Ω 15.0 k Ω VO VAUX RFB1 U1 VFB VBUS VSEC RFB2 NA T1 NS D CO NP PI-6837-120312 D S FB BP CP PD CONTROL -150 -300 -450 -600 -750 -1050 -1200 -900 FEEDBACK Pin Current During MOSFET On-Time 110 100 90 80 70 |
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