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参数资料
| 型号： | XRP6124ES0.5-F |
| 厂商： | Exar Corporation |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM SOT23-5 |
| 标准包装： | 250 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 833kHz |
| 占空比： | 92% |
| 电源电压： | 3 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： | -40°C ~ 125°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 散装 |
| 其它名称： | 1016-1429 |
X R P 6 1 2 4
N o n - S y n c h r o n o u s P F E T S t e p - D o w n C o n t r o l l e r
L = ( V IN ? V OUT ) ? ?
? ?
Δ I L
8 × C OUT × fs
? ?
I High ? I LOW
= L ×
C OUT
? ( V + V transient ) ? V OUT ?
I OUT × V OUT × ( V IN ? V OUT )
OUTPUT INDUCTOR
Select the output inductor L1 for inductance L,
DC current rating I DC and saturation current
rating I SAT . I DC should be larger than regulator
output current. I SAT , as a rule of thumb, should
be 50% higher than the regulator output
current. Calculate the inductance from:
? V OUT ?
? Δ I L × fs × V IN ?
Where:
Δ I L is peak-to-peak inductor current ripple
nominally set to 30% of I OUT
f S is nominal switching frequency from table 2
OUTPUT CAPACITOR C OUT
Select the output capacitor for voltage rating,
capacitance C OUT and Equivalent Series
Resistance ESR. The voltage rating, as a rule
of thumb, should be twice the output voltage.
When calculating the required capacitance,
usually the overriding requirement is current
load-step transient. If the unloading transient
requirement (i.e., when I OUT transitions from a
high to a low current) is met, then usually the
loading transient requirement (when I OUT
transitions from a low to a high current) is met
as well. Therefore calculate the C OUT
capacitance based on the unloading transient
requirement from:
2 2
? ?
2 2
? OUT
Where:
L is the inductance calculated in the preceding
step
I High is the value of I OUT prior to unloading. This
is nominally set equal to regulator current
rating.
I Low is the value of I OUT after unloading. This is
nominally set equal to 50% of regulator
current rating.
V transient is the maximum permissible voltage
transient corresponding to the load step
mentioned above. V transient is typically specified
from 3% to 5% of V OUT .
ESR of the capacitor has to be selected such
that the output voltage ripple requirement
V OUT(ripple) , nominally 1% of V OUT , is met.
Voltage ripple V OUT(ripple) is composed mainly of
two components: the resistive ripple due to
ESR and capacitive ripple due to C OUT charge
transfer. For applications requiring low voltage
ripple, ceramic capacitors are recommended
because of their low ESR which is typically in
the range of 5m ? . Therefore V OUT(ripple) is
mainly capacitive. For ceramic capacitors
calculate the V OUT(ripple) from:
V OUT(ripple ) =
Where:
C OUT is the value calculated above
If tantalum or electrolytic capacitors are used
then V OUT(ripple) is essentially a function of ESR:
V OUT(ripple ) = Δ I L × ESR
INPUT CAPACITOR C IN
Select the input capacitor for voltage rating,
RMS current rating and capacitance. The
voltage rating, as a rule of thumb, should be
50% higher than the regulator’s maximum
input voltage. Calculate the capacitor’s current
rating from:
I CIN, RMS = I OUT × D × ( 1 ? D )
Where:
I OUT is regulator’s maximum current
D is duty cycle (D=V OUT /V IN )
Calculate the C IN capacitance from:
C IN = 2
fs × V IN × Δ V IN
Where:
Δ V IN is the permissible input voltage ripple,
nominally set to 1% of V IN .
? 2011 Exar Corporation
9/12
Rev. 1.1.0
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