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LD7261 Datasheet Preview

LD7261 Datasheet

Photoflash Capacitor Charger

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Photoflash Capacitor Charger
LD7261
3/21/2005
REV: 01
General Description
The LD7261 is an ideal charge control IC for flash units with
internal soft start, adjustable charging current and output
voltage. It provides a proprietary charging algorithm, which
charges photoflash capacitor quickly and efficiently. The
LD7261 is specially designed for automatically and linearly
lowering the charging current at lower battery voltage. As
well, a built-in totem pole IGBT driver can drive IGBT quickly
and save the board space.
The LD7261 is available in a space-saving MSOP-10
package and is ideal for DSC flash unit.
Features
Adjustable Charging Current
Adjustable Output Voltage
Supports Auto Refresh
1.8V~5V Battery Voltage Range
Internal Soft Start
Tiny Transformer
Totem-Pole IGBT Driver
Applications
DSC Flash Unit
Film Camera Flash Unit
g Patented
Typical Application
VOUT
C2
160µF
ZD1
300V
D1 T1
VCC
C3
1µF
VIN
C1
33µF
VDD
C4 R2
R1 0.1µF 1M
100K
READY
IGBT RG
GATE
VCC OUT1
FB
SEC
ISET
RS CS
3.9
LD7261
CHARGE
READY
CHARGE
OUT2
TRIGGER TRIGGER
GND
Q1
RI
Q1: AOS / AO3402,
T1: 10T: 250T, LP=8µH / EFD 6.5 (12T: 300T, LP=10µH/EFD6.5)
ZD1:Origin / FC0300M
CS: 4.7~10nF
RI: >600K
Fig. 1
Leadtrend Technology Corporation
LD7261-DS-01 March, 2005
1




Leadtrend

LD7261 Datasheet Preview

LD7261 Datasheet

Photoflash Capacitor Charger

No Preview Available !

Pin Configuration
MSOP-10 (TOP VIEW)
10 9 8 7 6
TOP MARK
YYWWPP
12345
YY: Year code
WW: Week code
PP: Production code
LD7261
Ordering Information
Part number
LD7261 CL
LD7261 PL
Package
MSOP-10
MSOP-10
(PB FREE)
Top Mark
7261CL
7261PL
Shipping
2500 /tape & reel
2500 /tape & reel
Pin Descriptions
PIN NAME
1 FB
2 CHARGE
3 SEC
4 GND
5 OUT2
6 OUT1
7 VCC
8 TRIGGER
9 READY
10 ISET
Output voltage feedback
FUNCTION
Charging on/off control pin. High=enable low=disable
Secondary winding pin
IC GND
Totem-pole output (IGBT driver)
Totem-pole output (MOS driver)
Input power of IC
Trigger on/off control pin. High=enable low=disable
Charge ready open drain output.
Adjust charging current with R to GND.
Leadtrend Technology Corporation
LD7261-DS-01 March, 2005
2


Part Number LD7261
Description Photoflash Capacitor Charger
Maker Leadtrend
Total Page 8 Pages
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