參數(shù)資料
型號(hào)： LTC1159-5
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 323K
代理商： LTC1159-5
12
LTC1159/LTC1159-3.3/LTC1159-5
APPLICATIU
W
U
U
Figure 6. High Efficiency Adjustable Regulator with 5.5V < V
OUT
< 13V
0.15
μ
F
V
IN
CAP
P-DRIVE
P-GND
EXTV
CC
V
FB
LTC1159
I
TH
C
T
P-GATE
V
CC
V
CC
SHDN2
SENSE
–
SENSE
+
IRFZ34
VN2222LL
0.1
μ
F
100pF
5M
1N4148
V
IN
IRF9Z34
1N5819
0.01
μ
F
100
100
+
100
μ
F
50V
+
150
μ
F
16V
OS-CON
+
1
μ
F
0V = NORMAL
>3V = SHUTDOWN
3300pF
C
390pF
1k
N-GATE
S-GND
V
OUT
R1
24.9k
LTC1159 F06
R2
215k
V
OUT
=
(
VALUES SHOWN FOR V
OUT
= 12V/2.5A
)
1 +R1
100
μ
H
R
0.039
1.25
comparator at 0V common mode, increasing the off-time
approximately 40% and requiring the use of a smaller
timing capacitor C
T
.
Inverting Regular Applications
The LTC1159 can also be used to obtain negative output
voltages from positive inputs. In these inverting applica-
tions, the current sense resistor connects to ground while
the LTC1159 and N-channel MOSFET connections, which
would normally go to ground, instead ride on the negative
output. This allows the negative output voltage to be set by
the same process as in conventional applications, using
either the internal divider (LTC1159-3.3, LTC1159-5) or an
external divider with the adjustable version.
Figure 15 in the Typical Applications shows a synchronous
12V to –12V converter which can supply up to 1A with
better than 85% efficiency. By grounding the EXTV
CC
pin in
the Figure 15 circuit, the entire 12V output voltage is placed
across the driver and control circuits since the LTC1159
ground pins are at –12V. During start-up or short-circuit
conditions, operating power is supplied by the internal
4.5V regulator. The shutdown signal is level-shifted to the
negative output rail by Q3, and Q4 ensures that Q1 and Q2
remain off during the entire shutdown sequence.
Efficiency Considerations
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Percent efficiency can be
expressed as:
%Efficiency = 100 – (L1 + L2 + L3 + ...)
where L1, L2, etc., are the individual losses as a percentage
of input power.
Although all dissipative elements in the circuit produce
losses, four main sources usually account for most of the
losses in LTC1159 circuits: 1) LTC1159 V
IN
current, 2)
LTC1159 V
CC
current, 3) I
2
R losses, and 4) P-channel
transition losses.
1. LTC1159 V
IN
current is the DC supply current given in
the electrical characteristics which excludes MOSFET
driver and control currents. V
IN
current results in a small
(<1%) loss which increases with V
IN
.
2. LTC1159 V
CC
current is the sum of the MOSFET driver
and control circuit currents. The MOSFET driver current
results from switching the gate capacitance of the power
MOSFETs. Each time a MOSFET gate is switched from
相關(guān)PDF資料
PDF描述
LTC1159IS RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1159IS-3.3 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1159IS-5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1174 High Efficiency Step-Down and Inverting DC/DC Converter(高效率,反相DC/DC變換器)
LTC1174-3.3 High Efficiency Step-Down and Inverting DC/DC Converter(高效率,步降DC/DC變換器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1159CG 功能描述:IC REG CTRLR BUCK PWM CM 20-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(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 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159CG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 20-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(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 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159CG#TR 功能描述:IC REG CTRLR BUCK PWM CM 20-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(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 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1159CG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 20-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(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1159CG-3.3 功能描述:IC REG CTRLR BUCK PWM CM 20-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(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 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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