參數(shù)資料
型號(hào)： LTC1159IS-5
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 0.05 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 288K
代理商： LTC1159IS-5
8
LTC1159
LTC1159-3.3/LTC1159-5
MAXIMUM OUTPUT CURRENT (A)
0
R
S
)
0.12
0.16
0.20
4
LTC1159 F02
0.08
0.04
0
1
2
3
5
0.10
0.14
0.18
0.06
0.02
Figure 2. R
SENSE
vs Maximum Output Current
APPLICATIU
W
U
U
I
BURST
≈
15mV
R
SENSE
I
SC(PK)
= 150mV
R
SENSE
The LTC1159 automatically extends t
OFF
during a short
circuit to allow sufficient time for the inductor current to
decay between switch cycles. The resulting ripple current
causes the average short-circuit current I
SC(AVG)
to be
reduced to approximately I
MAX
.
L and C
T
Selection for Operating Frequency
The LTC1159 uses a constant off-time architecture with
t
OFF
determined by an external timing capacitor C
T
. The
value of C
T
is calculated from the desired continuous mode
operating frequency, f:
)
1 – V
OUT
A graph for selecting C
T
versus frequency including the
effects of input voltage is given in Figure 3.
As the operating frequency is increased the gate charge
losses will be higher, reducing efficiency (see Efficiency
Considerations). The complete expression for operating
frequency is given by:
)
C
T
= 7.8 10
–5
f
)
V
IN
f =
1
t
OFF
)
1 –V
OUT
V
IN
where t
OFF
= 1.3 10
4
C
T
Once the frequency has been set by C
T
, the inductor L
must be chosen to provide no more than 0.025V/R
SENSE
of peak-to-peak inductor ripple current. This results in a
minimum required inductor value of:
L
MIN
= 5.1 10
5
R
SENSE
C
T
V
REG
As the inductor value is increased from the minimum value,
the ESR requirements for the output capacitor are eased at
the expense of efficiency. If too small an inductor is used,
the LTC1159 may not enter Burst Mode operation and
efficiency will be severely degraded at low currents.
Inductor Core Selection
Once the minimum value for L is known, the type of
inductor must be selected. High efficiency converters
generally cannot afford the core loss found in low cost
powdered iron cores, forcing the use of more expensive
ferrite, molypermalloy or Kool M
μ
cores. Actual core loss
is independent of core size for a fixed inductor value, but
it is very dependent on the inductance selected. As induc
-
tance increases, core losses go down but copper (I
2
R)
losses will increase.
Ferrite designs have very low core loss, so design goals can
concentrate on copper loss and preventing saturation.
Ferrite core material saturates “hard,” which means that
inductance collapses abruptly when the peak design cur-
rent is exceeded. This results in an abrupt increase in
FREQUENCY (kHz)
0
0
C
T
200
400
600
1400
1000
50
100
1200
800
150
200
250
V
OUT
= 5V
V
IN
= 48V
V
IN
= 12V
V
IN
= 24V
LTC1159 F03
Figure 3. Timing Capacitor Selection
Kool M
μ
is a registered trademark of Magnetics, Inc.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1159IS-5#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1159IS-5#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1159IS-5#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1160CN 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Interface IC
LTC1160CS 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Interface IC
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