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부품번호 | LD7270 기능 |
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기능 | Smart Photoflash Capacitor Charger | ||
제조업체 | Leadtrend | ||
로고 | |||
LD7270
6/18/2010
Smart Photoflash Capacitor Charger with Integrated MOS
REV:03
General Description
The LD7270 is an ideal charge control IC for flash units,
featuring internal soft start, adjustable charging current
and output voltage. It provides a charging algorithm to
speed up the charging with higher efficiency. The LD7270
can operate in desired constant peak current mode
through adjusting RI between ISET pin and GND. As well,
LD7270 uses separate source and sink pin of IGBT driver,
which enables the users to easily meet different IGBT
application requirements.
The LD7270 is available in a space-saving WDFN-10L
3x3 package and is ideal for DSC flash unit.
g Patented
Features
• 1.8V~6V Battery Voltage Range
• Adjustable Output Voltage
• Adjustable Input Current
• Integrated 47V Power MOS
• Separate Source and Sink Pin of IGBT Driver
• False Triggering Prevention
• Soft Start
• Output Voltage Overcharge Protection
• High Efficiency
Applications
• DSC Flash Unit
• Cell Phone with Camera
Typical Application
RI
=
40000
IPK -PRI
(Ω)
Fig.1
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
1
www.leadtrend.com.tw
Pin Configuration
WDFN-10 (3mm x 3mm)
10 9 8 7 6
7 270DH
YYWWPPT
1 23 4 5
YY: Year code
WW: Week code
PP: Production code
T: Thickness
W: 0.75mm (typical)
LD7270
Ordering Information
Part number
Package
Top Mark
Shipping
LD7270GDHW
WDFN-10L 3mm x 3mm
The LD7270 is ROHS compliant.
7270DH
2500 /tape & reel
Pin Descriptions
PIN NAME
1 FB
2 DONE#
3
4
5
6
7
8
9
10
Exposed
Metal Pad
TRIGGER
OUTP
OUTN
LX
VCC
VBAT
CHARGE
ISET
GND
FUNCTION
Output voltage feedback
Charge Done Indicator. DONE# is an open drain output that pulls low
when CHARGE is high and the circuit has finished charging the output
capacitor.
Trigger on/off control.
IGBT driver source output pin.
IGBT driver sink output pin.
NMOS drain pin. Connect to transformer primary as shown in Fig.1.
Input power of IC. Bypass with a 1μF ceramic capacitor close to IC GND.
Battery Voltage Input
Charging on/off control.
Input current setting pin.
IC GND. Exposed pad should be soldered to PCB board with a larger area
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
4
www.leadtrend.com.tw
4페이지 PARAMETER
Others
Thermal Shutdown
Max ON Time
Propagation Delay
LD7270
CONDITIONS
MIN TYP MAX UNITS
(Trigger=High) delay to
OUTP and OUTN
150
30
60
°C
μs
ns
Typical Performance Characteristics
Do ne#
VO UT
VB A T
IIN
Done #
VB AT
VOUT
IIN
Fig. 5 Charging Waveform VBAT=3V
Do ne#
Charg e
IIN
VOUT
Fig. 7 Soft Start Function
Fig. 6 Charging Wavef orm VBAT=4.2V
VO UT
VLX
IPK- PR I
Fig. 8 Typical Swit ching Waveform
Leadtrend Technology Corporation
LD7270-DS-03, June 2010
7
www.leadtrend.com.tw
7페이지 | |||
구 성 | 총 20 페이지수 | ||
다운로드 | [ LD7270.PDF 데이터시트 ] |
당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는 |
구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
LD7270 | Smart Photoflash Capacitor Charger | Leadtrend |
LD7271 | Smart Photoflash Capacitor Charger | Leadtrend |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |