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TOP244F Datasheet(PDF) 21 Page - Power Integrations, Inc. |
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TOP244F Datasheet(HTML) 21 Page - Power Integrations, Inc. |
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21 / 52 page  TOP242-250 21 M 12/04 increase efficiency. This design delivers 70 W at 19 V, from an 85 VAC to 265 VAC input, at an ambient of 40 °C, in a small sealed adapter case (4” x 2.15” x 1”). Full load efficiency is 85% at 85 VAC rising to 90% at 230 VAC input. Due to the thermal environment of a sealed adapter, aTOP249Y is used to minimize device dissipation. Resistors R9 and R10 externally program the current limit level to just above the operating peak DRAIN current at full load and low line. This allows the use of a smaller transformer core size without saturation during startup or output load transients. Resistors R9 and R10 also reduce the current limit with increasing line voltage, limiting the maximum overload power at high input line voltage, removing the need for any protection circuitry on the secondary. Resistor R11 implements an under-voltage and overvoltage sense as well as providing line feed-forward for reduced output line frequency ripple. With resistor R11 set at 2 MΩ, the power supply does not start operating until the DC rail voltage reaches 100 VDC. On removal of the AC input, the UV sense prevents the output glitching as C1 discharges, turning off the TOPSwitch-GX when the output regulation is lost or when the input voltage falls to below 40 V, whichever occurs first. This same value of R11 sets the OV threshold to 450 V. If exceeded, for example during a line surge, TOPSwitch-GX stops switching for the duration of the surge, extending the high voltage withstand to 700 V without device damage. Capacitor C11 has been added in parallel with VR1 to reduce Zener clamp dissipation. With a switching frequency of 132 kHz, a PQ26/20 core can be used to provide 70 W. To maximize efficiency, by reducing winding losses, two output windings are used each with their own dual 100 V Schottky rectifier (D2 and D3). The frequency reduction feature of the TOPSwitch-GX eliminates any dummy loading to maintain regulation at no load and reduces the no-load consumption of the power supply to only 520 mW at 230 VAC input. Frequency jittering provides conducted EMI meeting the CISPR 22 (FCCB)/EN55022Bspecification,usingsimplefiltercomponents (C7, L2, L3 and C6), even with the output earth grounded. To regulate the output, an optocoupler (U2) is used with a secondary reference sensing the output voltage via a resistor divider (U3, R4, R5, R6). Diode D4 and C15 filter and smooth the output of the bias winding. Capacitor C15 (1 µF) prevents the bias voltage from falling during zero to full load transients. Resistor R8 provides filtering of leakage inductance spikes, keeping the bias voltage constant even at high output loads. Resistor R7, C9 and C10 together with C5 and R3 provide loop compensation. Due to the large primary currents, all the small signal control components are connected to a separate source node that is Kelvin connected to the SOURCE pin of the TOPSwitch-GX. For improved common-mode surge immunity, the bias winding common returns directly to the DC bulk capacitor (C1). 19 V @ 3.6 A TOP249Y U1 U3 TL431 U2 PC817A D L S X F C RTN L2 820 µH 2A C6 0.1 µF X2 F1 3.15 A BR1 RS805 8A 600 V L3 75 µH 2A t ° T1 C13 0.33 µF 400 V C12 0.022 µF 400 V C11 0.01 µF 400 V RT1 10 Ω 1.7 A PI-2691-042203 All resistors 1/8 W 5% unless otherwise stated. J1 L N CONTROL CONTROL TOPSwitch-GX C1 150 µF 400 V PERFORMANCE SUMMARY Output Power: 70 W Regulation: ± 4% Efficiency: ≥ 84% Ripple: ≤ 120 mV pk-pk No Load Consumption: < 0.52 W @ 230 VAC C5 47 µF 16 V C3 820 µF 25 V L1 200 µH C2 820 µF 25 V C14 0.1 µF 50 V C4 820 µF 25 V C10 0.1 µF 50 V C9 4.7 nF 50 V C8 0.1 µF 50 V VR1 P6KE- 200 D2 MBR20100 C7 2.2 nF Y1 Safety D3 MBR20100 D4 1N4148 R11 2 M Ω 1/2 W R9 13 M Ω R8 4.7 Ω R1 270 Ω R2 1 k Ω R5 562 Ω 1% R4 31.6 k Ω 1% R7 56 k Ω R10 20.5 k Ω R3 6.8 Ω R6 4.75 k Ω 1% C15 1 µF 50 V D1 UF4006 Figure 42. 70 W Power Supply using Current Limit Reduction with Line and Line Sensing for UV and OV. |
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