HV9921N3-G Supertex, HV9921N3-G Datasheet

LED Drivers Switchmode PWM

HV9921N3-G

Manufacturer Part Number
HV9921N3-G
Description
LED Drivers Switchmode PWM
Manufacturer
Supertex
Datasheet

Specifications of HV9921N3-G

Operating Supply Voltage
85 V to 264 V
Maximum Supply Current
350 uA
Maximum Power Dissipation
740 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Package / Case
TO-92
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
Applications
Typical Application Circuit
Constant output current: 20mA
Universal 85-264VAC operation
Fixed off-time buck converter
Internal 475V power MOSFET
Decorative lighting
Low power lighting fixtures
1235 Bordeaux Drive, Sunnyvale, CA 94089
LED Lamp Driver IC
3-Pin Switch-Mode
VDD
HV9921
GND
General Description
The HV9921 is a pulse width modulated (PWM) high-
efficiency LED driver control IC. It allows efficient operation of
LED strings from voltage sources ranging up to 400VDC. The
HV9921 includes an internal high voltage switching MOSFET
controlled with fixed off-time (T
The LED string is driven at constant current, thus providing
constant light output and enhanced reliability. The output
current is internally fixed at 20mA for HV9921. 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
Tel: 408-222-8888
OFF
www.supertex.com
) of approximately 10.5μs.
HV9921

Related parts for HV9921N3-G

HV9921N3-G Summary of contents

Page 1

... HV9921. 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. VDD DRAIN HV9921 GND ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ) of approximately 10.5μs. OFF ● Tel: 408-222-8888 ● www.supertex.com HV9921 ...

Page 2

... OFF Note: * Denotes the specifications which apply over the full operating ambient temperature range of -40°C < Denotes guaranteed by design. Package Options TO-92 SOT-89 HV9921N3-G HV9921N8-G Pin Configurations Value -0.3 to +10V +5mA -40°C to +85°C -40° to +125°C -65° to +150°C ...

Page 3

... Bordeaux Drive, Sunnyvale, CA 94089 -40 - Junction Tem perature, °C 100 DRAIN Voltage 25° 125° DRAIN Voltage, V ● Tel: 408-222-8888 ● www.supertex.com HV9921 85 110 ...

Page 4

... Bordeaux Drive, Sunnyvale, CA 94089 4 is the current sense comparator threshold. The TH . Therefore, the initial output current accuracy might of the controller itself. These parasitic DRAIN )) L and lower junction capacitance DRAIN PCB L J ● Tel: 408-222-8888 ● www.supertex.com HV9921 and output PCB is the coil L (~10nF (3) ...

Page 5

... AC line voltage. The coefficients K AC can be determined from the minimum duty ratio of 0.7 0 0.3 0.2 0.1 0 0.1 0.2 0.3 0.4 Dm and K C Universal AC, 85-264VAC String of 10 LED (LW541C by OSRAM V = 4.1V max. each) F ● Tel: 408-222-8888 ● www.supertex.com HV9921 (9) (10) C 0.5 0.6 0.7 d ...

Page 6

... IN ECQ-E4104KF by Panasonic (0.1µF, 400V, IN LED ● Tel: 408-222-8888 ● www.supertex.com HV9921 41V   ) −     -LED 12 ...

Page 7

... VDD T = OFF 10.5µ REF - 300ns BLANK HV9921 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 7 DRAIN DRAIN ZERO VOLTAGE ZERO VOLTAGE TRANSITION TRANSITION DRAIN DRAIN DRAIN Regulator 7.5V R ● Tel: 408-222-8888 ● www.supertex.com HV9921 , Ch3 Ch3: I DRAIN DRAIN , Ch3 Ch3: I DRAIN DRAIN ...

Page 8

... D1 and the HV9921 together should IN be kept as small as possible. The switching loop area connecting the output filter capacitor C , the inductor L1 and the diode D1 together should be kept O as small as possible. Figure 7. Recommended circuit board layout with the HV9921N3 AC Line 85-264VAC Pin Description Pin # Function Description 1 DRAIN Drain terminal of the output switching MOSFET and a linear regulator input ...

Page 9

... Dimensions NOM - (inches) MAX .210 JEDEC Registration TO-92. * This dimension is not specified in the original JEDEC drawing. The value listed is for reference only. † This dimension is a non-JEDEC dimension. Drawings not to scale. Supertex Doc.#: DSPD-3TO92N3, Version D080408 Front View E E1 ...

Page 10

... Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship ...

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