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Número de pieza | ZXSC440 | |
Descripción | PHOTOFLASH CHARGER | |
Fabricantes | Zetex Semiconductors | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de ZXSC440 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
No Preview Available ! PHOTOFLASH CHARGER
ZXSC440
DESCRIPTION
The ZXSC440 is a dedicated photoflash charger,
charging an 80F 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.
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.
FEATURES
• Charges a 80F photoflash capacitor to 300V in
3.5 seconds from 3V
APPLICATIONS
• Digital camera flash unit
• Film camera flash unit
• Charges various value photoflash capacitors
• Over 75% flyback efficiency
• Charge and Ready pins
• Consumes only 4.5A when not charging
TYPICAL APPLICATION CIRCUIT
• 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
DRAFT ISSUE F - MAY 2004
TEMPERATURE RANGE
-40°C to +85°C
PART
MARK
ZXSC440
TAPING
OPTIONS
TA, TC
1 SEMICONDUCTORS
1 page ZXSC440
TYPICAL OPERATING CHARACTERISTICS
(For typical application circuit at VIN=3V and TA=25 °C unless otherwise stated)
DRAFT ISSUE F - MAY 2004
5
SEMICONDUCTORS
5 Page High power digital camera photoflash charger
Specification
VIN =
VOUT =
Efficiency =
Charging time =
3V
275V
69%
5 seconds
Circuit diagram
ZXSC440
Bill of materials
Ref Value
U1
U2
Q1
D1 200V
D2 200V
D3 2A
Tx1
R1 22m⍀
R2 130⍀
R3 2k2⍀
R4 10M⍀/400V
R5 10k⍀
C1 100uF/10V
C2 220nF
C3 10pF/500V
C4 10nF/6V3
C5 120uF/330V
Package
MSOP8
SOT23-6
SOT23
SOT23
SOT23
SOT23-6
0805
0805
0805
Axial
0805
0805
0805
1206
1206
Radial
Part number
ZXSC440
ZXTD6717
FMMT619
BAS21
BAS21
ZLLS2000
PAO367
RL1210
Generic
Generic
Generic
Generic
Generic
GRM Series
Generic
Generic
FW Series
Manufacturer
Zetex
Zetex
Zetex
Philips
Philips
Zetex
Pulse
Cyntec
Generic
Generic
Generic
Generic
Murata
Murata
Generic
Generic
Rubycon
Notes
NPN/PNP dual
50V NPN low sat
200V fast rectifier
200V fast rectifier
2A Schottky diode
See note (1)
Output voltage across resistor
Output voltage seen across capacitor
Photoflash capacitor
NOTES:
(1) Transformer specification: Primary inductance: 24uH, Core: Pulse PAO367, Turns ratio: 1:12
DRAFT ISSUE F - MAY 2004
11
SEMICONDUCTORS
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet ZXSC440.PDF ] |
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