HV9906
Initial Release
TM
HV9906 FlexSwitch
(Simple Off-Line/PFC & >9V DC/DC Switcher)
General Description
Features
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Drive one or hundreds of LEDs including White LEDs
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).
Programmable Current Source (mA to A)
Programmable Voltage Source (Steps Up or Down)
Integrator Lock Loop Technology (IL2)
o
o
o
o
o
Built in Soft Start
Allows Discontinuous Feedback
Eliminates Compensation Components
Eliminates Output Averaging Filters
Inherent Dither to Reduce EMI
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Eliminates High Voltage Input Electrolytic Capacitor
Smallest and Most Reliable Off-Line Solution
Isolated or Non-Isolated Applications
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.
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
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
Seamlessly Change from AC to Battery Operation
Applications
rectified AC input to 265VRMS
.
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LED driver
The HV9906 utilizes a programmable inversely proportional fast
feed forward algorithm to calculate output on time and a novel
Integrating Lock Loop (IL2) feedback with programmable threshold
differential sensing. The sensed feedback may be positive or
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
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
frequency with only
requirements.
a small dither which helps meet FCC
Typical Application Circuit
NPN Bipolar Transistor Array or Matched 2N2222
1N4007
D1 D2
L2
D5
MURS160
D6
MURS160
15uH
12VDC to 400VDC
or
Q1
Q2
Q3
Q25
Negative Voltage
65VAC to 280VAC
-
D4 D3
C3
C4
D7
0.033uF
Optional
MURS160
+
C1
0.047uF
400V
LED-1
LED-1
Row 2
LED-1
Row 3
LED-1
L1
Row 1
Row 25
56uH
20mA
20mA
20mA
20mA
R1
8M
U1
M1
LED-9
Row 1
LED-9
Row 2
LED-9
Row 3
LED-9
R3
+Vin
IRFBC30AF
Row 25
GATE
900k
Von
Vdd
NS
HV9906
R5
100
LED-10
Row 2
LED-10
Row 3
LED-10
Row 25
C2
PS
R4
R2
1uF
100k
to
300k
AGND
PGND
6.8uF
1
07/23/02
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
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