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參數(shù)資料
| 型號： | LT1307IS8#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.25 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LT1307IS8#TR |
15
LT1307/LT1307B
1307fa
Externally Controlled Burst Mode Operation
This circuit overcomes the limitation of load-based
transitioning between Burst Mode operation and constant
switching mode by adding external control. If M1’s gate is
grounded by an external open-drain signal, the converter
functions normally in constant switching mode, delivering
3.3V. Output noise is low, however efficiency at loads less
than 1mA is poor due to the 1mA supply current of the
LT1307B. If M1’s gate is allowed to float, the low-battery
detector now drives the VC pin. R3 and R2 set the output
to 3V by allowing M1’s gate to go to VOUT until the output
voltage drops below 3V. R1 adds hysteresis, resulting in
low-frequency Burst Mode operation ripple voltage at the
output. By pulling the VC pin below a VBE, quiescent
current of the LT1307B drops to 60
A, resulting in accept-
able efficiency at loads in the 100
A range.
VIN
VC
SW
FB
LBO
LBI
LT1307B
L1
10
H
MBR0520
100k
2
CELLS
1nF
1
F
CERAMIC
1307 F19
GND
SHDN
C2*
10
F
CERAMIC
R3
698k
R4
1M
R2
49.9k
R5
590k
R1
10M
C1
100
F
VOUT
3.3V
200mA
300k
VOUT
M1
2N7002
GROUND = HIGH POWER/LOW NOISE
FLOAT = Burst Mode OPERATION
SHUTDOWN
3.0V IN LOW-POWER
Burst Mode OPERATION
C1 = AVX TPSC107K006R0150
L1 = COILCRAFT DO1608-103
SUMIDA CD43-100
C2 OPTIONAL: REDUCES OUTPUT
RIPPLE CAUSED BY C1'S ESR
*
+
0.2s/DIV
1307 F20
This photo details output voltage as the circuit is switched
between the two modes. Load current is 100
A in Burst
Mode operation; 10mA in constant switching mode.
This photo shows transient response in constant switch-
ing mode with a 10mA to 100mA stepped load. Output
ripple at the switching frequency can be reduced consid-
erably by adding a 10
F ceramic capacitor in parallel with
the 100
F tantalum.
10mA
100
A
IL
VOUT
500mV/DIV
2ms/DIV
1307 F21
VOUT
100mV/DIV
100mA
10mA
IL
TYPICAL APPLICATIO S
U
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| LT1308ACF | 功能描述:IC REG BOOST 5V 1A 14TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
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