参数资料
型号: LTC1735CGN#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 16-SSOP
标准包装: 100
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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 85°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 管件
产品目录页面: 1333 (CN2011-ZH PDF)
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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