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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 6A (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 Stop when Vin 19V IOutmax:= 106mA IOutmax:= 30mA IOutmax:= 12.5mA 350mW Output Power 150mW Output Power 500mW Output Power all outputs at 50% Load
Board Layout and Connections
PWRGD Measurement TP's
Vout=3.3V RLOAD
Vout=5.0V RLOAD ON/OFF
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
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. 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. 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. 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. 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 5.0V 1nF C4 3.3VRE
SK15
+
Vin
C3 4700uF
TX1
9
W4
VOUT3 (Isolated)
Jout+
D4 DL4002
3
8 12
M1
TN2524
GND
1nF
Jout-
100uF
1
W1 W2
10
C2 4700uF Q1 R17
10nF
26.1K
+
Rgate
C5
+Cout
W3
11
D2 SK15 1nF C8
10 CS
GND
3.3nF VDD R5+ R4 12.2M R12 1K STOP To S ync Pin START Ext Sync M3
47nF
1nF C9 C1 4.7uF SS 1 2 3 4 5 6 7 8 9 10
+
3.3V
Cin2 33uF, 450V
VDD
R9 62.4K SENSE R10 FB 2.61K R11
Rsense 1
Sync
Cstat
C10
STATUS
R6+ R2 2.0M
2N7000 10k R16
R7+ R3 5.7M
Csync
560k
RT
20 19 18 17 16 15 14 13 12 11
C7 330pF 3.3nF C6 10nF
R1 100k
35K
CCA
CB GATE
Css
10pF
HV9606
CREF 1uF 100nF CVX2
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
VDD START STOP Vin REF SS SYNC RT SGND PGND
1 20
STATUS SENSE FB COMP NI CA CB VX2 GATE CS
2
19
3
18
5
HV9606
4
17
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.
16
6
15
7
14
8
13
9
12
10
11
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. 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 6A at VIN = 20V. VREF - This pin provides a !1% tolerance reference voltage. 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.
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 0.1F. CA and CB - The charge pump circuit uses a capacitor (typically 0.01F) connected between these pins to generate the VX2 voltage. NI - High impedance non-inverting input of the error amplifier. COMP - The output of the error amplifier. FB - High impedance inverting input 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 10A 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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 CCA CIN2 COUT CREF CSS CSTAT CSYNC CVX2 D1 D2 D4 M1 M3 Q1 R1 R2 R3 R4 R5 R6 R7 R9 R10 R11 R12 R16 R17 RGATE RSENSE RT TX1 U1 Part Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Diode Diode Diode MOSFET MOSFET Bipolar Transistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Transformer IC HV9606 SSOP Value 4.7uF, 10 Volts 4700uF, 6.3 Volts 4700uF, 6.3 Volts .001uF, 50 Volts .001uF, 50 Volts 3.3nF, 50 Volts 330pF, 50 Volts .001uF, 50 Volts .001uF, 50 Volts .0033uF, 200 Volts 10nF, 50 Volts 33uF, 450 Volts 100uF, 100 Volts 1uF, 16 Volts 47nF, 50 Volts 10nF, 50 Volts 10pF, 50 Volts 100nF, 50 Volts 1 Amp, 50 Volt 1 Amp, 50 Volt 1 Amp, 100 Volt TN2524N8 2N7000 MMBTA56 100K, 1% 2M, 1% 3M, 1% 10M, 1% 2.2M, 1% 0, 1% 2.7M, 1% 62K, 1% 2.61K, 1% 34.8K, 1% 1K, 5% 10K, 5% 26K, 5% 10, 5% 1, 1 Watt, 5% 560K, 1% Footprint SMD-1206 Radial Radial SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 Radial Radial SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-SMB SMD-SMB MELF SOT-223 TO-92 SMD-SOT23 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-0805 SMD-RW1SOBa SMD-0805 Part No. Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Diodes, Inc. #B150B or equivalent Diodes, Inc. #B150B or equivalent Diodes, Inc. #DL4002 or equivalent Supertex, Inc. Supertex, Inc. Fairchild Semiconductor or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent Panasonic or equivalent EPCOS Supertex, Inc.
4 09/05/2002 Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com

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