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