IC PHOTOFLASH CHARGER 8MSOP

 

ZXSC440X8TA

Manufacturer Part NumberZXSC440X8TA
DescriptionIC PHOTOFLASH CHARGER 8MSOP
ManufacturerDiodes Zetex
ZXSC440X8TA datasheets

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Specifications of ZXSC440X8TA

ApplicationsPhotoflash Capacitor ChargerCurrent - Supply220µA
Voltage - Supply1.8 V ~ 8 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesZXSC440X8TR
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PHOTOFLASH CHARGER
DESCRIPTION
The ZXSC440 is a dedicated photoflash charger,
charging an 80 F photoflash capacitor to 300V in 3.5
seconds from a 3V supply.
The flyback conversion efficiency is typically 75%,
much higher than the commonly used discrete
charging circuits.
The Charge pin enables the circuit to be initiated from
the camera's microprocessor, using negligible current
when flash is not being used.
FEATURES
•
Charges a 80 F photoflash capacitor to 300V in
3.5 seconds from 3V
•
Charges various value photoflash capacitors
•
Over 75% flyback efficiency
•
Charge and Ready pins
•
Consumes only 4.5 A when not charging
•
Small MSOP8 low profile package
PINOUT
MSOP8 pin TOP VIEW
ORDERING INFORMATION
DEVICE
DEVICE DESCRIPTION
ZXSC440X8TA
Camera flash charger
ZXSC440X8TC
•
TA reels hold 1000 devices
•
TC reels hold 4000 devices
ISSUE 1 - JANUARY 2005
The Ready pin signals the microprocessor when the
flash is charged and ready to be fired.
A small amount of hysteresis on the voltage feedback
shuts down the device as long as the capacitor remains
fully charged, again using negligible current.
APPLICATIONS
•
Digital camera flash unit
•
Film camera flash unit
TYPICAL APPLICATION CIRCUIT
TEMPERATURE RANGE
PART
MARK
-40°C to +85°C
ZXSC440
1
ZXSC440
TAPING
OPTIONS
TA, TC
S E M I C O N D U C T O R S

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ZXSC440X8TA Summary of contents

  • Page 1

    ... Consumes only 4.5 A when not charging • Small MSOP8 low profile package PINOUT MSOP8 pin TOP VIEW ORDERING INFORMATION DEVICE DEVICE DESCRIPTION ZXSC440X8TA Camera flash charger ZXSC440X8TC • TA reels hold 1000 devices • TC reels hold 4000 devices ISSUE 1 - JANUARY 2005 The Ready pin signals the microprocessor when the flash is charged and ready to be fired ...

  • Page 2

    ZXSC440 ABSOLUTE MAXIMUM RATINGS PARAMETER V CC DRIVE READY CHARGE V , SENSE FB Operating temperature Storage temperature Power dissipation at 25°C ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER V V range CC CC (1) Iq Quiescent current I Shutdown current STDN (2) ...

  • Page 3

    ABSOLUTE MAXIMUM RATINGS PIN # NAME DESCRIPTION 1 DRIVE Drive output for external switching transistor. Connect to base or gate of external switching transistor 2 V Reference voltage. Internal threshold set to 300mV. Connect external resistor FB network to set ...

  • Page 4

    ZXSC440 DEVICE DESCRIPTION Bandgap reference All threshold voltages and internal currents are derived from a temperature compensated bandgap reference circuit with a reference voltage of 1.22V nominal. If the REF terminal is used as a reference for external devices, the ...

  • Page 5

    TYPICAL OPERATING CHARACTERISTICS (For typical application circuit at V ISSUE 1 - JANUARY 2005 =3V and T =25 °C unless otherwise stated ZXSC440 ...

  • Page 6

    ZXSC440 APPLICATIONS Switching transistor selection The choice of switching transistor has a major impact on the converter efficiency. For optimum performance, a bipolar transistor with low V CE(SAT) required. The V of the switching transistor is also an CEO important ...

  • Page 7

    Transformer parameters Proprietary transformers are available, for example the Pulse PAO367, Primary inductance: 24uH, Core: Pulse PAO367, Turns ratio: 1:12, see Bill of Materials below. If designing a transformer, bear in mind that the primary current may be over an ...

  • Page 8

    ZXSC440 Output power calculation This is approximately the power stored in the coil times the frequency of operation times the efficiency. Assuming a current of 1.2 amps in a 30µH primary, the stored energy will be 21.6µJ. The frequency is ...

  • Page 9

    Layout issues Layout is critical for the circuit to function in the most efficient manner in terms of electrical efficiency, thermal considerations and noise. For 'step-up converters' there are four main current loops, the input loop, power-switch loop, rectifier loop ...

  • Page 10

    ZXSC440 REFERENCE DESIGNS General camera photoflash charger Specification 275V OUT Efficiency = 71% Charging time = 4 seconds Bill of materials Ref Value Package U1 MSOP8 Q1 SOT23 (2) D1 200V SOT23 Tx1 R1 ...

  • Page 11

    High power digital camera photoflash charger Specification 275V OUT Efficiency = 69% Charging time = 5 seconds Bill of materials Ref Value Package U1 MSOP8 U2 SOT23-6 Q1 SOT23 D1 200V SOT23 D2 200V ...

  • Page 12

    ZXSC440 Low power digital camera photoflash charger Specification 275V OUT Efficiency = 58% Charging time = 6.8 seconds Bill of materials Ref Value Package U1 MSOP8 U2 SOT23-6 Q1 SOT23 D1 200V SOT23 D2 ...

  • Page 13

    NOTES: ISSUE 1 - JANUARY 2005 13 ZXSC440 ...

  • Page 14

    ZXSC440 NOTES ISSUE 1 - JANUARY 2005 14 ...

  • Page 15

    NOTES: ISSUE 1 - JANUARY 2005 15 ZXSC440 ...

  • Page 16

    ZXSC440 PACKAGE OUTLINE 8 1 INDENT AREA (D/2 X E1/2) Controlling dimensions are in millimeters. Approximate conversions are given in inches PACKAGE DIMENSIONS Millimeters Inches DIM Min Max Min Max A - 1.10 - 0.0433 A1 0.05 0.15 0.002 0.006 ...

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