HV9906 Supertex Inc, HV9906 Datasheet

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HV9906

Manufacturer Part Number
HV9906
Description
Simple Off-Line/PFC & >9V DC/DC Switcher
Manufacturer
Supertex Inc
Datasheet
Features
Applications
Typical Application Circuit
Drive one or hundreds of LEDs including White LEDs
Programmable Current Source (mA to A)
Programmable Voltage Source (Steps Up or Down)
Integrator Lock Loop Technology (IL
Eliminates High Voltage Input Electrolytic Capacitor
Smallest and Most Reliable Off-Line Solution
Isolated or Non-Isolated Applications
Can be Operated Directly from Rectified AC Mains
10V to 400V Input Range Internal Regulator
<1.5mA Operating Supply Current
Programmable Feed Forward Regulation
Programmable Feedback Sense Threshold (mV to V)
Integrating Differential Sense Feedback
Seamlessly Change from AC to Battery Operation
LED driver
Power Factor Correction
Constant Current or Voltage Source
Battery Charger / PWM Housekeeping Supplies
Traffic Lights / Street Lights
Back Lighting of Flat Panel Displays
Advertising Signs
Automotive
12VDC to 400VDC
or
65VAC to 280VAC
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
o Built in Soft Start
o Allows Discontinuous Feedback
o Eliminates Compensation Components
o Eliminates Output Averaging Filters
o Inherent Dither to Reduce EMI
1N4007
D1
0.047uF
D4 D3
400V
C1
100k
D2
R1
8M
R2
1uF
to
6.8uF
(Simple Off-Line/PFC & >9V DC/DC Switcher)
C2
2
)
Von
Vdd
AGND
HV9906 FlexSwitch
HV9906
+Vin
U1
PGND
GATE
NS
PS
MURS160
56uH
0.033uF
D5
L1
C3
M1
IRFBC30AF
1
MURS160
MURS160
D6
D7
General Description
The Supertex HV9906 allows the development of the smallest
possible, most reliable, offline and wide DC/DC conversion range
converters for driving LEDs and other applications. The HV9906
combines internally all the components required to operate directly
from the rectified AC line with a feedback mechanism that
eliminates filters & compensation components, and which can
close the loop with feedback from a discontinuous waveform (eg.
LED current).
The HV9906 is capable of driving multiconverters, which have
been shown to provide the best performance to component count
trade off for wide conversion range applications like offline
converters. Applicable multiconverters include bucking & boosting
topologies, in isolated & non-isolated configurations, as well as
power factor correcting topologies from <1W up to 150W.
Proper choice of external components will allow the programming
of currents from <1mA to several amps and will allow stepping up
or stepping down from the input without the need to change
components. For example, the same HV9906 converter nominally
regulating to 60VDC output may operate from 12VDC, or from
rectified AC input to 265V
The HV9906 utilizes a programmable inversely proportional fast
feed forward algorithm to calculate output on time and a novel
Integrating Lock Loop (IL
differential sensing.
negative with respect to ground and the signal may be
discontinuous. In some topologies this control method permits the
elimination of the bulky input filter capacitor (a small high voltage
ceramic or film capacitor is required to maintain a high frequency
path). This algorithm when used with certain multiconverters such
as the flyback-buck, with a fixed load, results in near constant
frequency with only a small dither which helps meet FCC
requirements.
Optional
15uH
900k
300k
R3
R4
L2
C4
+
-
100
R5
TM
Q1
LED-9
Row 1
LED-1
Row 1
20mA
NPN Bipolar Transistor Array or Matched 2N2222
The sensed feedback may be positive or
Q2
2
RMS
) feedback with programmable threshold
LED-1
Row 2
LED-9
Row 2
LED-10
Row 2
.
20mA
Q3
LED-1
Row 3
LED-9
Row 3
LED-10
Row 3
20mA
Negative Voltage
Initial Release
Q25
HV9906
07/23/02
LED-1
Row 25
LED-9
Row 25
LED-10
Row 25
20mA

Related parts for HV9906

HV9906 Summary of contents

Page 1

... HV9906 FlexSwitch General Description The Supertex HV9906 allows the development of the smallest possible, most reliable, offline and wide DC/DC conversion range converters for driving LEDs and other applications. The HV9906 2 ) combines internally all the components required to operate directly from the rectified AC line with a feedback mechanism that eliminates filters & ...

Page 2

... Typical under UVLO mA * Gate pin open and operating Decaying nSec C = 750pF GATE nSec C = 750pF GATE nSec V = 5.0V ON uSec V = 0.2V ON uSec KHz KHz V * Note: V and V are matched Note: V and V are matched HV9906 Dice HV9906X MAX 07/23/02 ...

Page 3

... PS – This pin is the positive terminal of the differential sense feedback circuit. 1V Bandgap Reference Vref Vdd C VCO C Delay Sample Pulse Delay Vdd 1V 3 controls the on time (pulse width) of the gate output. IN Vdd Vref Driver S 1V HV9906 GATE PGND NS PS 07/23/02 ...

Page 4

... Functional Description The HV9906 consists of the following functional blocks: High Voltage Regulator Bandgap Reference Under Voltage Lockout and Power On Reset Voltage Controlled Oscillator Feed Forward On Time Control Differential Sense Circuit and Programmable Reference Integrator Sample and Hold VCO Control Gate Driver ...

Page 5

... VCO cycle. Thereafter, the differential sense feedback loop increments the frequency in small steps, increasing the power transfer rate until output regulation is achieved, thereby providing the required soft start function HV9906 2 ) feedback controls the For certain off-line topologies, the 07/23/02 ...

Page 6

... Protection PS NS The HV9906 used as a current source is inherently protected in the case of an output short. Over voltage protection is easily accomplished, in the flyback-buck application for example, with no more than two diodes. Simple protection for voltage mode applications, and other topologies is easy to accomplish. Call for more information ...

Page 7

... IN The maximum power dissipation in the resistor will RMS and the maximum power dissipation in the HV9906 will which for an SOIC packaged device will result in junction to ambient temperature difference of 159 C/W x 0.48W = 76.32 C, thereby allowing operation ambient temperature of 73.68 C for the absolute maximum junction temperature of 150 C. ...

Page 8

... PS This method limits the +V voltage depletion MOSFET for all input voltages and in fact raises the maximum allowable peak input voltage to the breakdown voltage rating of the depletion MOSFET. dissipation in the HV9906 is now given by the equation Power Dissipation HV9906 = ( OFF ...

Page 9

... NPN Bipolar Transistor Array or Matched 2N2222 Negative Voltage - + LED-1 LED-1 LED-1 Row 1 Row 2 Row 3 20mA 20mA 20mA LED-9 LED-9 LED-9 Row 1 Row 2 Row 3 R5 LED-10 LED-10 100 Row 2 Row 3 HV9906 Q25 LED-1 Row 25 20mA LED-9 Row 25 LED-10 Row 25 07/23/02 ...

Page 10

... LED-5 Row 1 R9 Input Voltage 80VAC to 135VAC LED String Forward Voltage 20V Power Factor >0.95 THD <15% P 10W D6 L2 MURS120T3 - 12V C3 Lead-Acid D7 + Battery MURS120T3 R5 R3 13.3k 225k R6 M1 500 R7 R4 0.5 150k HV9906 LED-1 LED-1 Row 2 Row 3 LED-2 LED-2 Row 2 Row 3 LED-5 LED-5 Row 2 Row 3 07/23/02 ...

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