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| 型号： | LTC3833IUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-QFN |
| 标准包装： | 91 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2.2MHz |
| 电源电压： | 4.5 V ~ 38 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： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3833
APPLICATIONS INFORMATION
V OUT ?
V OUT
f ? ? I L(MAX) ?
V IN(MAX) ?
R SENSE =
? I L(MAX)
I OUT(MAX) –
ripplecurrentdoesnotexceedaspecifiedmaximum,the
inductance should be chosen according to:
?
L = ? ? 1 ? ?
Once the value for L is known, the type of inductor must
be selected. High efficiency converters generally cannot
tolerate the core loss of low cost powdered iron cores,
forcing the use of more expensive ferrite, molypermalloy
or Kool Mμ cores. Ferrite core material saturates hard ,
meaning that inductance collapses abruptly when the
peak design current is exceeded. This results in an abrupt
increase in inductor ripple current and consequent output
voltage ripple. Do not allow the core to saturate!
A variety of inductors designed for high current, low volt-
age applications are available from manufacturers such as
Sumida, Panasonic, Coiltronics, Coilcraft, Toko, Vishay,
Pulse and Wurth.
Current Sense Pins and Current Limit Programming
Inductor current is sensed through the SENSE + and
SENSE – pins and fed into the internal current compara-
tors. The common mode input voltage range of the cur-
rent comparators is –0.5V to 5.5V. Both SENSE pins are
high impedance inputs. When the common mode range
is between –0.5V to 1.1V, there is no input bias current,
and when between 1.4V and 5.5V, there is less than 1μA
of current flowing into the pins. Between 1.1V and 1.4V,
the input bias current will be zero if the common mode
voltage is ramped up from 1.1V and less than 1μA if the
common mode voltage is ramped down from 1.4V. The
high impedance inputs to the current comparator allow
accurate DCR sensing. However, care must be taken not
to float these pins during normal operation.
in the LTC3833 and external component values. Note that
ITH is close to 2.4V when in current limit.
An external resistive divider from INTV CC can be used
to set the voltage on the V RNG pin between 0.6V and 2V,
resulting in maximum sense voltages between 30mV and
100mV. The wide voltage sense range allows for a variety
of applications. The V RNG pin can also be tied to either
SGND or INTV CC to force internal defaults. When V RNG is
tied to SGND, the device operates with a maximum sense
voltage of 30mV. When the V RNG pin is tied to INTV CC , the
device operates with a maximum sense voltage of 50mV.
R SENSE Inductor Current Sensing
A typical R SENSE inductor current sensing scheme is
shown in Figure 3. R SENSE is chosen based on the required
maximum output current. Given the maximum current,
I OUT(MAX) , maximum sense voltage, V SENSE(MAX) , set by the
V RNG pin, and maximum inductor ripple current, ? I L(MAX) ,
the value of R SENSE can be chosen as:
V SENSE(MAX)
2
Conversely, given R SENSE and I OUT(MAX) , V SENSE(MAX)
and thus the V RNG voltage could be determined from the
above equation. To assure that the maximum rated output
current can be supplied for different operating conditions
and component variations, sufficient design margin should
be built into these calculations.
R SENSE RESISTOR
AND
PARASITIC INDUCTANCE
R ESL
V OUT
The maximum allowed sense voltage V SENSE(MAX) between
SENSE + and SENSE – is set by the voltage applied to the
V RNG pin and is given by:
V SENSE(MAX) = 0.05 ? V RNG
LTC3833
SENSE +
SENSE –
C F
R F
R F
3833 F03
The current mode control loop does not allow the induc-
tor current valleys to exceed 0.05 ? V RNG . In practice, one
should allow sufficient margin to account for variations
FILTER COMPONENTS
PLACED NEAR SENSE PINS
Figure 3. R SENSE Current Sensing
3833f
15
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