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參數(shù)資料
| 型號： | LTC1873EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Quadruple 2-Input Positive-AND Gate 14-TSSOP -40 to 85 |
| 中文描述： | 5 A SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 25/32頁 |
| 文件大小： | 308K |
| 代理商： | LTC1873EG |
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25
LTC1873
with 20mV of hysteresis, allowing fairly precise control of
the auxiliary voltage. If the LTC1873 is in discontinuous or
Burst Mode operation and the auxiliary output voltage
drops, the FCB pin will trip and the LTC1873 will resume
continuous operation regardless of the load on the main
output. The FCB pin removes the requirement that power
must be drawn from the inductor primary in order to
extract power from the auxiliary windings. With the loop in
continuous mode, the auxiliary outputs may be loaded
without regard to the primary load. Note that if the LTC1873
is already running in continuous mode and the auxiliary
output drops due to excessive loading, no additional
action can be taken by the LTC1873 to regulate the
auxiliary output.
later removed, the LTC1873 will latch off again unless the
latch is reset by cycling the power or RUN/SS pins.
OPTIMIZING PERFORMANCE
Maximizing High Load Current Efficiency
Efficiency at high load currents (when the LTC1873 is
operating in continuous mode) is primarily controlled by
the resistance of the components in the power path
(QT, QB, L
EXT
) and power lost in the gate drive circuits due
to MOSFET gate charge. Maximizing efficiency in this
region of operation is as simple as minimizing these
terms.
The behavior of the load over time affects the efficiency
strategy. Parasitic resistances in the MOSFETs and the
inductor set the maximum output current the circuit can
supply without burning up. A typical efficiency curve
(Figure 14) shows that peak efficiency occurs near 30%
of this maximum current. If the load current will vary
around the efficiency peak and will spend relatively little
time at the maximum load, choosing components so that
the average load is at the efficiency peak is a good idea.
This puts the maximum load well beyond the efficiency
peak, but usually gives the greatest system efficiency over
time, which translates to the longest run time in a battery-
powered system. If the load is expected to be relatively
constant at the maximum level, the components should be
chosen so that this load lands at the peak efficiency point,
well below the maximum possible output of the converter.
Figure 14. Typical LTC1873 Efficiency Curves
+
TG
1/2
LTC1873
BG
FCB
C
OUT
R
FCB1
+
C
OUT(AUX)
V
OUT(AUX)
1873 F13
+
C
IN
QT
QB
V
OUT
V
IN
R
FCB2
Figure 13. Regulating an Auxiliary Output with the FCB Pin
FAULT FLAG
The FAULT pin is an open-drain output that indicates if one
or both of the outputs has exceeded 15% of its pro-
grammed output voltage. FAULT includes an internal 10
μ
A
pull-up to V
CC
and does not require an external pull-up to
interface to standard logic. FAULT pulls low in normal
operation, and releases when a overvoltage fault is
detected.
When an overvoltage fault occurs, an internal latch sets
and FAULT goes high, disabling the LTC1873 until the
latch is cleared by recycling the power or pulling both
RUN/SS pins low simultaneously. Alternately, the FAULT
pin can be pulled back low externally with an open-
collector/open-drain device or an N-channel MOSFET or
NPN, which will allow the LTC1873 to resume normal
operation, but will not reset the latch. If the pull-down is
LOAD CURRENT (A)
0
70
E
80
90
100
5
10
1873 G01
15
V
IN
= 5V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.6V
APPLICATIOU
W
U
U
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1873EG#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1873EG#TR | 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1873EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1874EGN | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1874EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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