Prepare by Telecom Group 1 Rev. D 3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9904
Preliminary Engineering Specification
HV9904 Multi Converter Controller
Features
Eliminates High Voltage Input Electrolytic Capacitor
Smallest and Most Reliable Off-Line Solution
Constant Current or Constant Voltage Mode Control
Can be Operated Directly from Rectified AC Mains
10V to 400V Input Range Internal Regulator
1.5mA Operating Supply Current
PLL Based Loop Control with Soft Start
On-Time Varies Inversely with Input Voltage
Frequency Varies with Load
2.5V Differential Sense
Recommended for <10W Applications
Applications
Universal Input Voltage LED driver
Constant Current Source
Battery Charger
Ordering Information
Package Options
8 Pin Plastic DIP
8 Pin SOIC
Dice
HV9904P HV9904LG HV9904X
General Description
The Supertex HV9904 is a second order PWM controller designed
to provide a constant average current output or a constant average
voltage output from an input of 10V to 400V DC or directly from
rectified AC mains up to 280V. The second order topology is
capable of extremely high dynamic control range, allowing
operation directly from rectified AC mains without the need for
bulky and expensive high voltage input electrolytic capacitor.
The PWM control utilizes feed forward circuitry to compensate for
large variations in input voltage (i.e. rectified AC) and a novel
integrator lock loop PLL scheme to regulate a differentially sensed
feedback node where the signal may be discontinuous. This
feedback node could be a current sense resistor or divider from
regulated output voltage. For a constant load the switching
frequency will be nearly constant with a dither of a few kHz helping
to meet FCC conducted emissions requirements.
A high input voltage linear regulator provides a stable Vdd supply
for the internal circuitry and gate drive to the external MOSFET.
Under voltage lockout provides a power on reset and protection for
the MOSFET
Typical Application Circuit
PS
GATE
+Vin
Vdd
AGND
HV9904
1mH
220uH
0.1uF
10VDC to 400VDC
or
VAC to 265V
1 to 8
LEDs
250
VN2460N8
or
IRFBC30AS
1uF
0.01uF
10mA
PGND
NS
0.1uF
C1
D1
D2
D4
D3
C2
L1
L2
C3
C4
MURS120T3
D6
D7
R1
M1
U1
400V
1N4007
D5
MURS120T3
MURS120T3
Universal Input Constant Average Currrent LED Lamp Power Supply
Prepare by Telecom Group 2 Rev. D 3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9904
Electrical Characteristics
(-40
C T
A
+85
C)
Symbol Parameter Min
Typ
Max
Units
Conditions
Input Regulator/Vdd Supply
+V
IN
Regulator Input Voltage
10
400
V
+I
IN
Input Current
1.5
mA
V
DD(REG)
Regulator Output Voltage
10
V
V
DD(RIPPLE)
Maximum Ripple Voltage
1
V(P-P)
UVLO
Under Voltage Lockout Threshold
8
V
UVLO
Under Voltage Lockout Hysteresis
0.5
V
MOSFET Gate Drive Output
t
R
Rise Time
75
nSec C
OUT
= 750pF
t
F
Fall Time
75
nSec C
OUT
= 750pF
PWM
P
MIN
Minimum Output Pulse Width
200
300
nSec +V
IN
= 400V
P
MAX
Maximum Output Pulse Width
2
uSec +V
IN
= 15V
f
MIN
Minimum Output Frequency
10
kHz +V
IN
= 15V, V
PS
= 0V, V
NS
= -4V
Current Sense
V
PS
- V
NS
Current
Sense
Voltage
2.3 2.5 2.7 V
-5V
V
PS
0V, -5V V
NS
0V
Absolute Maximum Ratings*
+V
IN
Input Voltage
-0.3V to +450V
Operating Ambient Temperature Range -40
C to +85C
Operating Junction Temperature Range -40
C to +125C
Storage Temperature Range
-65
C to +150C
Power Dissipation @ 25
C, SOIC
750mW
Power Dissipation @ 25
C, Plastic DIP 750mW
*All voltages referenced to AGND and PGND connected together.
Prepare by Telecom Group 3 Rev. D 3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9904
Pinout
1
2
3
4
5
6
7
8
HV9904
+Vin
Vdd
AGND
PS
GATE
NC
PGND
NS
Pin Description
+V
IN
This is the input to the internal linear regulator that provides
the constant voltage VDD internal supply for the PWM. It can
accept DC input voltages in the range of 10 to 400 Volts.
V
DD
This is the output of the internal linear regulator and the
supply pin for the PWM circuits. It must be bypassed with a
capacitor capable of storing sufficient energy so that the voltage
does not decay below the UVLO threshold during the time when
the input voltage is below the minimum required by the regulator.
NC No internal connection to this pin.
AGRD Common connection for analog circuits.
GATE This is the PWM output for driving the gate of an N-
channel external MOSFET.
PGRD Common connection for GATE drive circuit.
NS This is negative sense input to the PWM control circuit.
PS This is positive sense input to the PWM control circuit
__________________________________________________________________________________________________________________
Functional Block Diagram
Regulator
UVLO
Vdd
+Vin
Vdd
AGND
Integrator
Reference
Vref
Variable Frequency and
Duty Cycle Oscillator
Gate
Driver
Differential
Sense
GATE
PGND
PS
NS
Functional Description
On initial power application the high input voltage (10V to 400V)
linear regulator charges the capacitor connected to Vdd and seeks
to provide a stable supply for the internal circuitry and gate drive to
the external MOSFET. Under voltage lockout (UVLO) holds the
oscillator disabled and reset to its lowest frequency state until the
Vdd supply rises above 8Volts assuring sufficient gate drive
voltage for the external MOSFET. Once Vdd is above the UVLO
threshold the oscillator is enabled and the external MOSFET is
driven via the gate driver at the oscillator frequency. The UVLO
has a 0.5V hysteresis to prevent false triggering due to ripple on
Vdd.
The duty cycle of the oscillator output and thus the on time of the
MOSFET is determined by a feed forward circuit that sets the
maximum on time based on the instantaneous value of the input
voltage, thus avoiding core saturation of the magnetic elements.
The oscillator is initially operating at its lowest frequency and
continues to operate at this low frequency for several cycles to
assure that a stable equilibrium state is reached. After this initial
delay the feedback circuit is enabled and the oscillator frequency is
increased in small steps on oscillator cycles until the PWM output
(current or voltage) reaches the programmed value. Since the rate
of increase in frequency is a function of the frequency the oscillator
frequency will rise exponentially.
The differential sense circuit monitors the programming node
(voltage on current sense resistor for constant average current
control or voltage on resistive divider for constant average voltage
control) using an integrator lock loop feedback to obtain a stable
average value from even a discontinuous signal. As long as this
average value is less than 2.5V the oscillator frequency is
incremented. When the average value reaches 2.5V the oscillator
frequency incrementing is halted. If the average value exceeds
2.5V then the oscillator frequency is decremented. In this manner
the oscillator frequency is dithered to maintain output regulation
while the feed forward sensing of the input voltage maintains a
fixed value of energy transfer per oscillator cycle.
Line regulation is controlled by the instantaneous feed forward
sensing of the input voltage, thus the PWM can easily track a full
wave rectified sine wave of input voltage at 50Hz, 60Hz or 400Hz
provided that the capacitor connected at Vdd can store sufficient
energy to prevent decay below the UVLO threshold during the time
when the resulting input voltage at +Vin is below 10V. For a 50Hz
rectified sine wave a 1
F capacitor connected to Vdd is sufficient
to guarantee stable operation at 50Hz.
Load regulation is controlled via the feedback sensing circuit by
adjusting the oscillator frequency to maintain average energy
transfer consistent with the load conditions. For relatively stable
load conditions this method achieves excellent regulation. For a
constant load the switching frequency will be nearly constant with a
dither of a few kHz helping to meet FCC conducted emissions
requirements.
Prepare by Telecom Group 4 Rev. D 3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9904
Application Information
Non-Isolated Constant Current Output PWM
PS
GATE
+Vin
Vdd
AGND
HV9904
1mH
220uH
0.1uF
10VDC to 400VDC
or
VAC to 265V
1 to 8
LEDs
250
VN2460N8
or
IRFBC30AS
1uF
0.01uF
10mA
PGND
NS
0.1uF
C1
D1
D2
D4
D3
C2
L1
L2
C3
C4
MURS120T3
D6
D7
R1
M1
U1
400V
1N4007
D5
MURS120T3
MURS120T3
Universal Input Constant Average Currrent LED Lamp Power Supply
This circuit provides a constant average current output, which may
be used to power LED lamps. The circuit maintains a constant
average current and the value of C4 capacitor controls the peak-to-
peak ripple, which decreases with increasing capacitor value. If
very high current ripple values are permissible then C4 may be
omitted. The following BOM provides a list of suggested
components.
Item Number
Quantity
Reference
Value
Manufacturer
1 1
C1
0.1
F, 500V
Vishay
2 1
C2
1
F, 15V
Vishay
3 1
C3
0.01
F, 500V
Vishay
4 1
C4
0.1
F,25V
Vishay
5
4
D1, D2, D3, D4
1N4007
On Semiconductor
6
3
D5, D6, D7
MURS120T3
On Semiconductor
7 1
L1
DO1608C-105
Coilcraft
8 1
L2
DO1608C-224
Coilcraft
9 1
M1
VN2460N8
Supertex
10 1 R1
250
11 1 U1
HV9904LG
Supertex
Total Part Count
16
Prepare by Telecom Group 5 Rev. D 3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9904
Application Information - Continued
Non-Isolated Constant Voltage Output PWM
PS
GATE
+Vin
Vdd
AGND
HV9904
1mH
220uH
100uF
10VDC to 400VDC
or
VAC to 265VAC
25k
VN2460N8
or
IRFBC30AS
1uF
0.01uF
PGND
NS
0.1uF
C1
D1
D2
D4 D3
C2
L1
L2
C3
C4
MURS120T3
D6
D7
R1
M1
U1
400V
1N4007
D5
MURS120T3
MURS120T3
Universal Input Power Supply
R2
25k
-5V
This circuit provides a non-isolated constant voltage output. The
value of C4 capacitor controls the peak-to-peak ripple, which
decreases with increasing capacitor value. The following BOM
provides a list of suggested components.
Item Number
Quantity
Reference
Value
Manufacturer
1 1
C1
0.1
F, 500V
Vishay
2 1
C2
1
F, 15V
Vishay
3 1
C3
0.01
F, 500V
Vishay
4 1
C4
100
F, 6.3V
Panasonic
5
4
D1, D2, D3, D4
1N4007
On Semiconductor
6
3
D5, D6, D7
MURS120T3
On Semiconductor
7 1
L1
DO1608C-105
Coilcraft
8 1
L2
DO1608C-224
Coilcraft
9 1
M1
VN2460N8
Supertex
10 1 R1
25k
11 1 R2
25k
12 1 U1
HV9904LG
Supertex
Total Part Count
17
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