Datasheet HV9606DB1 Datasheet (Supertex)

Page 1

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 1 Watt

Efficiency ≥70 V

= 48V all outputs at 50% Load

Input Voltage Range 20V to 100V

Input Voltage Lockout Start when Vin ≥ 21V Stop when Vin ≤ 19V

Switching Frequency 25kHz

3.3V Output 3.3V ± 1% I 5V Output 5.0V ± 5% I

40V Isolated Output 40.0V (nominal) I

:= 106mA 350mW Output Power

Outmax

:= 30mA 150mW Output Power

Outmax

:= 12.5mA 500mW Output Power

Outmax

Remote On/Off Yes Remote Power Good Indicator Yes

Board Layout and Connections

PWRGD

Measurement TP's

Vout=3.3V

RLOAD

Vout=5.0V

RLOAD

ON/OFF

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

Vout=40V

RLOAD

Page 2

Ext Sync

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.

Schematic Diagram

R16

10k

33uF, 450V

Cin2

VDD

R12

To S ync P in

2N7000

STOP

START

Vin

R5+

12.2M

R6+

2.0M

R7+

5.7M

VOUT3 (Isolated)

Jout+

Jout-

GND

3.3nF

C10

Sync

10pF

Css 47nF

Csync

DL4002

Cout

1nF

100uF

VDD

1nF

4.7uF

1 2 3 4 5 6 7 8 9

10 11

560k

TX1

3.3V

STATUS

HV9606

CREF

1uF

JOUT+, JOUT-

Connect 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.

SK15

4700uF

1nF

Cstat

10nF

R17

26.1K

SK15

4700uF

SENSE

20 19 18 17 16 15 14 13 12

C7 330pF

3.3nF

R1 100k

CCA10nF

1nF C8

62.4K

R10

2.61K

R11

35K

Rgate

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

TN2524

Rsense

GATE

5.0V

3.3VR

GND

Page 3

HV9606DB1

Pinout / Measurement TP’s

VDD

START

STOP

Vin

REF

SYNC

SGND

PGND

6 0 6 9

V H

STATUS

SENSE

COMP

VX2

GATE

Pin Descriptions

VDD – This is the supply pin for the PWM Logic and Analog

circuits. When the input voltage to the V 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 V 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 V regulator start voltage.

STOP – The resistive divider from V 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 6µA at V 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.

pin exceeds the

sets the start-up

= 20V.

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 V

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.

CS – This is the current sense input. Under normal

operation the over current limit is triggered when the voltage on this pin exceeds 0.5V

, however, current

REF

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 0.5V

GATE – This push-pull CMOS output is designed to drive

REF

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 V

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.

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

0.85V circuit changes state a nominal 0.85V

+ 0.075V. When the input voltage is decaying the

REF

– 0.075V.

REF

STATUS – This is the output of the supervisory circuit. When the sense-input voltage is high, this output is pulled up to V

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

Page 4

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

26 R2 Resistor

27 R3 Resistor

28 R4 Resistor

29 R5 Resistor

30 R6 Resistor

31 R7 Resistor

32 R9 Resistor

33 R10 Resistor

34 R11 Resistor

35 R12 Resistor

36 R16 Resistor

37 R17 Resistor

38 RGATE Resistor

39 RSENSE Resistor

40 RT Resistor

41 TX1 Transformer EPCOS

42 U1 IC HV9606 SSOP Supertex, Inc.

100KΩ, 1%

2MΩ, 1% 3MΩ, 1%

10MΩ, 1%

2.2MΩ, 1% 0Ω, 1%

2.7MΩ, 1%

62KΩ, 1%

2.61KΩ, 1%

34.8KΩ, 1% 1KΩ, 5%

10KΩ, 5% 26KΩ, 5%

10Ω, 5%

1Ω, 1 Watt, 5%

560KΩ, 1%

SMD-0805 Panasonic or equivalent

SMD-RW1SOBa Panasonic or equivalent

SMD-0805 Panasonic or equivalent

HV9606DB1

4 09/05/2002

Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com

Datasheet HV9606DB1 Datasheet (Supertex)

Specifications and Main Features

Frequently Asked Questions

User Manual