HV9922 Supertex, Inc., HV9922 Datasheet

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HV9922

Manufacturer Part Number
HV9922
Description
3-pin Switch-mode Led Lamp Driver Ic
Manufacturer
Supertex, Inc.
Datasheet

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HV9922N3-G
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HV9922N8
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Features
Applications
Typical Application Circuit
Constant output current: 50mA
Universal 85-264VAC operation
Fixed off-time buck converter
Internal 475V power MOSFET
Decorative lighting
Low power lighting fi xtures
LED Lamp Driver IC
3-Pin Switch-Mode
VDD
HV9922
GND
General Description
The HV9922 is a pulse width modulated (PWM) high-
effi ciency LED driver control IC. It allows effi cient operation of
LED strings from voltage sources ranging up to 400VDC. The
HV9922 includes an internal high voltage switching MOSFET
controlled with fi xed off-time (T
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 of 85
to 264VAC or DC input voltage of 20 to 400V.
DRAIN
OFF
) of approximately 10.5μs.
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 ...

Page 2

... 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 ...

Page 3

... Junction Tem perature, ° DRAIN Voltage 25° 125° DRAIN Voltage, V HV9922 110 40 40 ...

Page 4

... • 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 ...

Page 5

... 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 ⎞ ...

Page 6

... 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 ...

Page 7

... 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 ...

Page 8

... 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. ...

Page 9

... 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 - - ...

Page 10

... 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 ...

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