HV9922 Supertex, Inc., HV9922 Datasheet
HV9922
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HV9922 Summary of contents
Page 1
... The LED string is driven at constant current, thus providing constant light output and enhanced reliability. The output current is internally fi xed at 50mA for HV9922. The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range 264VAC or DC input voltage 400V ...
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... W = Code for week sealed H22YW Y = Code for year sealed = “Green” Packaging SOT-89 (N8) Max Units Conditions - V --- - V --- - V --- - mV --- 350 µ 8.5V, V DD(EXT) DRAIN - V --- 210 Ω 50mA DRAIN 5 400V DRAIN - mA --- 63 mA --- 400 ns --- 650 ns --- 13 µs --- < +85°C. A HV9922 VDD GND = 40V ...
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... Junction Tem perature, ° DRAIN Voltage 25° 125° DRAIN Voltage, V HV9922 110 40 40 ...
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... • ΔI O OFF the forward voltage of the LED string time of the HV9922. The output current in the LED string (I is calculated then as (Δ where I ripple current introduces a peak-to-average error in the output current setting that needs to be accounted for ...
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... T is the minimum blanking time of 200ns, and BLANK(MIN the maximum instantaneous input voltage. IN(MAX) Estimating Power Loss Discharging the parasitic capacitance C the HV9922 is responsible for the bulk of the switching power loss. It can be estimated using the following equation: ⎛ 2 ⎞ ...
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... Step 4. Calculating the leading edge spike duration using (4), (5) = 135V x √2 x 33pF + 50ns ≈ 113ns < SPIKE 100mA Step 5. Estimating power dissipation in HV9922 at 135VAC using (8) and (10) Let us assume that the overall effi ciency η = 0.7. Figure 2. Universal 85-264VAC LED Lamp Driver D2 D4 ...
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... Figure 4. Switch-Off Transition. Ch1: V Figure 6. Switch-Off Transition. Ch1: V Figure 6. Switch-Off Transition. Ch1: V GND VDD T = OFF 10.5µs Regulator S Q REF - 300ns BLANK HV9922 7 , Ch3 Ch3: I DRAIN DRAIN ZERO VOLTAGE ZERO VOLTAGE TRANSITION TRANSITION DRAIN DRAIN DRAIN 7.5V R HV9922 DRAIN DRAIN , Ch3 Ch3: I DRAIN DRAIN ...
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... RF emission. The switching node copper area connected to the DRAIN pin should be located as of the HV9922, the anode of D1 and the inductor L1 needs to be minimized. A large switching node area can increase high frequency radiated EMI. ...
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... Bottom View Symbol A MIN .170 Dimension NOM - (inches) MAX .210 Drawings not to scale Side View .014 .014 .175 - - - .022 .022 .205 9 HV9922 .125 .080 .095 .045 - - - - .165 .105 .105 .055 L .500 - - ...
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... MAX 1.60 0.56 JEDEC Registration TO-243, Variation AA, Issue C, July 1986. Drawings not to scale. (The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline information go to http://www.supertex.com/packaging.html.) DSFP# HV9922 A122707 ...