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| 型号： | LTC1735CF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 25/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20TSSOP |
| 标准包装： | 74 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 335kHz |
| 占空比： | 99.4% |
| 电源电压： | 4 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
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LTC1735
APPLICATIO S I FOR ATIO
1.5V
100mV/DIV
V IN = 12V
V OUT = 1.5V
OUTPUT
VOLTAGE
FIGURE 8 CIRCUIT
The network shown in Figure 11 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
15A
10A/DIV
0A
LOAD
CURRENT
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
50 μ s/DIV
1735 F09
voltage of 36V, most applications will be limited to 30V by
Figure 9. Normal Transient Response (Without R1, R4)
the MOSFET BV DSS .
50A I PK RATING
1.582V
100mV/DIV 1.5V
1.418V
V IN = 12V
V OUT = 1.5V
OUTPUT
VOLTAGE
FIGURE 8 CIRCUIT
12V
TRANSIENT VOLTAGE
SUPPRESSOR
GENERAL INSTRUMENT
V IN
LTC1735
1.5KA24A
15A
1735 F11
10A/DIV
0A
LOAD
CURRENT
50 μ s/DIV
1735 F10
Figure 11. Plugging into the Cigarette Lighter
Design Example
? I L = OUT ? 1 – OUT ?
Figure 10. Transient Response with Active Voltage Positioning
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
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:
V ? V ?
( f )( L ) ? V IN ?
The highest value of the ripple current occurs at the
maximum input voltage:
? 1 –
? = 1 . 7 A
cablebreaksconnection,thefieldcollapseinthealternator
can cause a positive spike as high as 60V which takes
several hundred milliseconds to decay. Reverse-battery is
? I L =
1 . 8 V ?
300 kHz ( 3 . 3 μ H ) ?
1 . 8 V ?
22 V ?
justwhatitsays,whiledouble-batteryisaconsequenceof
tow-truck operators finding that a 24V jump start cranks
cold engines faster than 12V.
The maximum ripple current is 33% of maximum output
current, which is about right.
1735fc
25
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| LTC1735CGN | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1735CGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC1735CGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1735CGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1735CGN1 | 制造商:Linear Technology 功能描述: |
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