SUPERTEX HV9606DB1

HV9606DB1
Current-Mode PWM Multiple Output Flyback Converter
Introduction
The Supertex HV9606DB1 evaluation board demonstrates the features of HV9606 IC by presenting a DC/DC
converter employing flyback technique to achieve multiple outputs:
• 3.3V non-isolated output with ± 1% accuracy. The output power is 350mW.
• 5V isolated output with ± 5% accuracy. The output power is 150mW.
• 40V nominal isolated output. The output power is 500mW.
The HV9606 current-mode PWM controller features a built-in start-up regulator that can be used to operate the IC
from inputs of 15V to 250V. Other features include built-in soft start, programmable input under voltage lockout and
hysteresis, and standby current of 6µA (below UVLO).
Specifications
Total Output Power
Efficiency
Input Voltage Range
Input Voltage Lockout
Switching Frequency
3.3V Output
5V Output
40V Isolated Output
Remote On/Off
Remote Power Good Indicator
1 Watt
≥70
20V to 100V
Start when Vin ≥ 21V
25kHz
3.3V ± 1%
5.0V ± 5%
40.0V (nominal)
Yes
Yes
Vin = 48V
all outputs at 50% Load
Stop when Vin ≤ 19V
IOutmax:= 106mA
IOutmax:= 30mA
IOutmax:= 12.5mA
350mW Output Power
150mW Output Power
500mW Output Power
Board Layout and Connections
PWRGD
Measurement TP's
Vout=3.3V
RLOAD
Vout=5.0V
ON/OFF
RLOAD
Vout=40V
RLOAD
U1 = HV9606
TX1 = EPCOS Transformer
-
+
VIN = 20V to 100 V
1
09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9606DB1
Instructions
JOUT+, JOUTConnect your load to these terminals. This is an
isolated 40.0V output. This output can typically
deliver a current up to 12.5mA.
Vin , GND
Connect 21 to 100V power source to these terminals:
positive to Vin , negative to GND.
3.3VREG, GND
Connect your load to these terminals. This is a
regulated 3.3V output. This output can typically
deliver a current up to 106mA.
ON/OFF
This is a remote inhibit pin. Connecting this pin to
GND will disable the converter. The converter will
resume operation beginning with soft start as the
ON/OFF pin is released.
5.0VREG, GND
Connect your load to these terminals. This is a 5.0V
output. This output can typically deliver a current up
to 30mA.
PWRGD
This is an active "High", remote power-good
indicator. This pin is utilized with CMOS coupled logic
of 3.3V for "High" and 0V for "Low".
EXT SYNC
Apply external clock, a 3.3 volt logic signal to Ext
Sync. Clock frequency has to exceed 25kHz to sync,
but not exceed 50kHz.
Schematic Diagram
D1
SK15
Vin
D4
DL4002
GND
VDD
+
1nF
C8
C2
4700uF
10
CS
Q1
STATUS
+
4.7uF
SS
R9
62.4K
26.1K
Rsense
1
SENSE
R10
FB
2.61K
R11
STOP
R6+ R2
2.0M
START
560k
RT
10pF
Csync
R7+ R3
5.7M
47nF
M3
Css
10k
R16
10
R17
C1
Sync
R12
2N7000
W2
1nF C9
C10
R5+ R4
12.2M
11
10nF
3.3nF
W3
3.3V
Jout-
1
VDD
GND
TN2524
D2
SK15
W1
100uF
Cin2
33uF, 450V
M1
12
Rgate
C5
8
Cstat
Jout+
3
1nF
Ext Sync
W4
+Cout
3.3VRE
9
TX1
To S ync Pin
1nF
C4
C3
4700uF
VOUT3 (Isolated)
1K
5.0V
+
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
C7
330pF
R1
100k
3.3nF
C6
10nF
CCA
35K
CB
GATE
HV9606
100nF
CVX2
CREF
1uF
Ref
COMP
VX2
2
09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9606DB1
Pinout / Measurement TP’s
1
20
STATUS
START
2
19
SENSE
STOP
3
18
FB
Vin
4
17
COMP
REF
5
16
NI
15
CA
14
CB
SS
6
SYNC
7
HV9606
VDD
RT
8
13
VX2
SGND
9
12
GATE
PGND
10
11
CS
SYNC – This I/O pin may be connected to the SYNC pin of
other HV9606 circuits and will cause the oscillators to lock
to the highest frequency oscillator. Synchronization to a
master clock is possible by means of an open collector or
open drain logic gate or optocoupler, provided the low duty
cycle does not exceed 50%. If synchronization is utilized
then a pull up resistor to VDD is required to overcome the
effects of parasitic capacitance on the circuit board. The
value of the resistor required will depend on the operating
frequency and master clock duty cycle.
RT – The resistor connected from this pin to SGND sets the
frequency of the internal oscillator by setting the charging
current for the internal timing capacitor. The PWM output
frequency is one half the oscillator frequency.
SGND – Common connection for all Logic and Analog
circuits.
PGND – Common connection for Gate Driver circuit.
Pin Descriptions
VDD – This is the supply pin for the PWM Logic and Analog
circuits. When the input voltage to the VIN pin exceeds the
start voltage the input regulator seeks to regulate the
voltage on the capacitor connected to this pin to a nominal
2.9V. After the PWM has started, the bootstrap supply will
regulate this voltage to a nominal 3.3V or 5V. With VIN
connected to PGND the circuit can be powered via this pin
in the voltage range of 2.9V to 5.5V with a nominal 2.8V
UVLO.
START – The resistive divider from VIN sets the start-up
regulator start voltage.
STOP – The resistive divider from VIN sets the start-up
regulator stop voltage. A low power sleep mode function
may be implemented by pulling this pin to SGND.
CS – This is the current sense input. Under normal
operation the over current limit is triggered when the
voltage on this pin exceeds 0.5VREF, however, current
sensing is blanked during the first 85ns on time of the
MOSFET to prevent false triggering during the turn on
switching transition. The loop control operating peak
current sense may be set to any level below 0.5VREF.
GATE – This push-pull CMOS output is designed to drive
the gate of an N-Channel power MOSFET.
VX2 – This is the supply pin for the Gate Driver circuit and
is generated by the Charge Pump VDD voltage doubler
circuit. It should be bypassed to PGND with a capacitor,
typically 0.1µF.
CA and CB – The charge pump circuit uses a capacitor
(typically 0.01µF) connected between these pins to
generate the VX2 voltage.
VIN – This is the startup linear regulator input. It can accept
DC input voltages in the range of 15V to 250V. With
START and STOP programmed to more than 20V, the
leakage current on this pin is less than 6µA at VIN = 20V.
NI – High impedance non-inverting input of the error
amplifier.
VREF – This pin provides a !1% tolerance reference
voltage.
FB – High impedance inverting input of the error amplifier.
SS – A capacitor connected to this pin determines the soft
start time. Soft start may be initiated by a low VX2 voltage
or an over current condition when supervisor circuit
STATUS output is low.
During short duration input
interruptions when the output voltage does not decay below
programmed limits, the supervisor circuit inhibits soft start
to permit rapid recovery of the system.
COMP – The output of the error amplifier.
SENSE – This is the input pin to the supervisory circuit. On
a rising input voltage the circuit changes state at a nominal
0.85VREF + 0.075V. When the input voltage is decaying the
circuit changes state a nominal 0.85VREF – 0.075V.
STATUS – This is the output of the supervisory circuit.
When the sense-input voltage is high, this output is pulled
up to VDD by a 10µA current source and the Soft Start
function is disabled. When the sense-input is low, this
output is pulled low and it may be used to directly control
the reset of a microprocessor or it may be used to drive an
optocoupler or LED indicator.
3
09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
HV9606DB1
Parts List
Item Reference
Part
Value
Footprint
Part No.
1
C1
Capacitor
4.7uF, 10 Volts
SMD-1206
Panasonic or equivalent
2
C2
Capacitor
4700uF, 6.3 Volts
Radial
Panasonic or equivalent
3
C3
Capacitor
4700uF, 6.3 Volts
Radial
Panasonic or equivalent
4
C4
Capacitor
.001uF, 50 Volts
SMD-0805
Panasonic or equivalent
5
C5
Capacitor
.001uF, 50 Volts
SMD-0805
Panasonic or equivalent
6
C6
Capacitor
3.3nF, 50 Volts
SMD-0805
Panasonic or equivalent
7
C7
Capacitor
330pF, 50 Volts
SMD-0805
Panasonic or equivalent
8
C8
Capacitor
.001uF, 50 Volts
SMD-0805
Panasonic or equivalent
9
C9
Capacitor
.001uF, 50 Volts
SMD-0805
Panasonic or equivalent
10
C10
Capacitor
.0033uF, 200 Volts
SMD-0805
Panasonic or equivalent
11
CCA
Capacitor
10nF, 50 Volts
SMD-0805
Panasonic or equivalent
12
CIN2
Capacitor
33uF, 450 Volts
Radial
Panasonic or equivalent
13
COUT
Capacitor
100uF, 100 Volts
Radial
Panasonic or equivalent
14
CREF
Capacitor
1uF, 16 Volts
SMD-0805
Panasonic or equivalent
15
CSS
Capacitor
47nF, 50 Volts
SMD-0805
Panasonic or equivalent
16
CSTAT
Capacitor
10nF, 50 Volts
SMD-0805
Panasonic or equivalent
17
CSYNC
Capacitor
10pF, 50 Volts
SMD-0805
Panasonic or equivalent
18
CVX2
Capacitor
100nF, 50 Volts
SMD-0805
Panasonic or equivalent
19
D1
Diode
1 Amp, 50 Volt
SMD-SMB
Diodes, Inc. #B150B or equivalent
20
D2
Diode
1 Amp, 50 Volt
SMD-SMB
Diodes, Inc. #B150B or equivalent
21
D4
Diode
1 Amp, 100 Volt
MELF
Diodes, Inc. #DL4002 or equivalent
22
M1
MOSFET
TN2524N8
SOT-223
Supertex, Inc.
23
M3
MOSFET
2N7000
TO-92
Supertex, Inc.
24
Q1
Bipolar Transistor
MMBTA56
SMD-SOT23
Fairchild Semiconductor or equivalent
25
R1
Resistor
100KΩ, 1%
SMD-0805
Panasonic or equivalent
26
R2
Resistor
2MΩ, 1%
SMD-0805
Panasonic or equivalent
27
R3
Resistor
3MΩ, 1%
SMD-0805
Panasonic or equivalent
28
R4
Resistor
10MΩ, 1%
SMD-0805
Panasonic or equivalent
29
R5
Resistor
2.2MΩ, 1%
SMD-0805
Panasonic or equivalent
30
R6
Resistor
0Ω, 1%
SMD-0805
Panasonic or equivalent
31
R7
Resistor
2.7MΩ, 1%
SMD-0805
Panasonic or equivalent
32
R9
Resistor
62KΩ, 1%
SMD-0805
Panasonic or equivalent
33
R10
Resistor
2.61KΩ, 1%
SMD-0805
Panasonic or equivalent
34
R11
Resistor
34.8KΩ, 1%
SMD-0805
Panasonic or equivalent
35
R12
Resistor
1KΩ, 5%
SMD-0805
Panasonic or equivalent
36
R16
Resistor
10KΩ, 5%
SMD-0805
Panasonic or equivalent
37
R17
Resistor
26KΩ, 5%
SMD-0805
Panasonic or equivalent
38
RGATE
Resistor
10Ω, 5%
SMD-0805
Panasonic or equivalent
39
RSENSE
Resistor
1Ω, 1 Watt, 5%
SMD-RW1SOBa
Panasonic or equivalent
40
RT
Resistor
560KΩ, 1%
SMD-0805
Panasonic or equivalent
41
TX1
Transformer
42
U1
IC
HV9606
SSOP
Supertex, Inc.
EPCOS
4
09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com