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參數(shù)資料
| 型號(hào)： | LTC1735C-1 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 373K |
| 代理商： | LTC1735C-1 |
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24
LTC1735
APPLICATIU
W
U
U
V
IN
= 12V
V
OUT
= 1.5V
1.5V
100mV/DIV
15A
0A
10A/DIV
OUTPUT
VOLTAGE
LOAD
CURRENT
50
μ
s/DIV
1735 F09
Figure 9. Normal Transient Response (Without R1, R4)
V
IN
= 12V
V
OUT
= 1.5V
1.582V
1.5V
1.418V
100mV/DIV
15A
0A
10A/DIV
50
μ
s/DIV
1735 F10
Figure 10. Transient Response with Active Voltage Positioning
OUTPUT
VOLTAGE
LOAD
CURRENT
Figure 11. Plugging into the Cigarette Lighter
Automotive Considerations: Plugging into the
Cigarette Lighter
As battery-powered devices go mobile, there is a natural
interest in plugging into the cigarette lighter in order to
conserve or even recharge battery packs during operation.
But before you connect, be advised: you are plugging
into the supply from hell. The main power line in an
automobile is the source of a number of nasty potential
transients, including load-dump, reverse-battery and
double-battery.
Load-dump is the result of a loose battery cable. When the
cable breaks connection, the field collapse in the alternator
can cause a positive spike as high as 60V which takes
several hundred milliseconds to decay. Reverse-battery is
just what it says, while double-battery is a consequence of
tow-truck operators finding that a 24V jump start cranks
cold engines faster than 12V.
The network shown in Figure11 is the most straight
forward approach to protect a DC/DC converter from the
ravages of an automotive power line. The series diode
prevents current from flowing during reverse-battery,
while the transient suppressor clamps the input voltage
during load-dump. Note that the transient suppressor
should not conduct during double-battery operation, but
must still clamp the input voltage below breakdown of the
converter. Although the LTC1735 has a maximum input
voltage of 36V, most applications will be limited to 30V by
the MOSFET BV
DSS
.
V
IN
50A I
PK
RATING
1735 F11
LTC1735
12V
TRANSIENT VOLTAGE
SUPPRESSOR
GENERAL INSTRUMENT
1.5KA24A
Design Example
As a design example, assume V
IN
= 12V(nominal),
V
IN
= 22V(max), V
OUT
= 1.8V, I
MAX
= 5A and f = 300kHz.
R
SENSE
and C
OSC
can immediately be calculated:
R
SENSE
= 50mV/5A = 0.01
C
OSC
= 1.61(10
7
)/(300kHz) – 11pF = 43pF
Assume a 3.3
μ
H inductor and check the actual value of the
ripple current. The following equation is used:
I
V
( )( )
f L
V
V
L
OUT
OUT
IN
=
–
1
The highest value of the ripple current occurs at the
maximum input voltage:
I
V
(3 3
kHz
H
V
V
A
L
=
μ
=
1 8
.
300
1
1 8
22
2 3
.
)
–
.
The maximum ripple current is 33% of maximum output
current, which is about right.
FIGURE 8 CIRCUIT
FIGURE 8 CIRCUIT
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| LTC1735CF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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 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 |
| LTC1735CF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC1735CF#TR | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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: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) |
| LTC1735CF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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: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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