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參數(shù)資料
| 型號： | LT303EMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.55 A FLUORESCENT LIGHT CONTROLLER, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LT303EMSE#TRPBF |
LT3003
8
3003fa
uses novel circuit techniques to reduce VEE and VMAX pin
currents to nano amp range ~10s after PWM low edge.
This preserves the output capacitor voltage and results
in higher PWM dimming ratios.
Buck-Boost Mode: PWM Dimming
The LT3003 can also perform PWM dimming in buck-boost
mode. The buck-boost conguration requires the PWM
and SHDN pins to be tied together. This conguration can
support up to a 2000:1 PWM dimming ratio.
DRV
LED DRIVER
SW
PWM
L1
D1
C1
C2
VIN
RSENSE
D1A
D2A
D3A
D1B
D2B
D3B
D1C
D2C
D3C
+
LED1
PWM
SHDN
VIN
OT1
OT2
LED2
LT3003
LED3
VEE
GND
3003 F03
VMAX
EA
Figure 3. Boost Mode
DRV
LED DRIVER
SW
C1
C2
D1
VIN
RSENSE
D1A
D2A
D3A
D1B
D2B
D3B
D1C
D2C
D3C
+
LED1
PWM
L1
PWM
OT1
OT2
SHDN
LED2
LT3003
LED3
VEE
GND
3003 F04
VIN
VMAX
EA
Figure 4. Buck Mode
C1
C2
D3C
D3B
D3A
3003 F05
LED3
D2C
D2B
D2A
LED2
GND
VEE
VIN
D1C
D1B
D1A
LED1
OT1 OT2
SHDN PWM
PWM
VIN VMAX
LT3003
DRV
LED DRIVER
SW
+
EA
L1
D1
RSENSE
Figure 5. Buck-Boost Mode
Overtemperature Protection
The LT3003 incorporates internal junction temperature
sensing and provides two open-collector outputs, OT1 and
OT2, which become active low when junction temperature
exceeds 125°C. The active OT1 output can sink 100A of
current and can be connected to system microprocessor.
The active low OT2 output can sink 300A of current and
can be connected to the switching regulator’s gm error
amplier output to defeat switching. The LT3003 has to
cool down by 6°C (119°C) for OT1 and OT2 outputs to
reset (collector outputs high).
APPLICATIONS INFORMATION
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