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参数资料
| 型号： | SP6137EU-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.04MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 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 ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
S P 6 1 3 7
W i d e I n p u t , 9 0 0 k H z S y n c h r o n o u s P W M S t e p D o w n
C o n t r o l l e r
exceed the tolerance limits expected on the
output voltage. During an output load
transient, the output capacitor must supply all
the additional current demanded by the load
until the SP6137CU adjusts the inductor
current to the new value.
Therefore the capacitance must be large
enough so that the output voltage is help up
while the inductor current ramps up or down
to the value corresponding to the new load
current. Additionally, the ESR in the output
capacitor causes a step in the output voltage
equal to the current. Because of the fast
transient response and inherent 100% and 0%
duty cycle capability provided by the
SP6137CU when exposed to output load
transient, the output capacitor is typically
chosen for ESR, not for capacitance value.
The output capacitor’s ESR, combined with the
inductor ripple current, is typically the main
contributor to output voltage ripple. The
maximum allowable ESR required to maintain
a specified output voltage ripple can be
calculated by:
I NPUT C APACITOR S ELECTION
The input capacitor should be selected for
ripple current rating, capacitance and voltage
rating. The input capacitor must meet the
ripple current requirement imposed by the
switching current. In continuous conduction
mode, the source current of the high-side
MOSFET is approximately a square wave of
duty cycle VOUT/VIN. Most of this current is
supplied by the input bypass capacitors. The
RMS value of input capacitor current is
determined at the maximum output current
and under the assumption that the peak to
peak inductor ripple current is low, it is given
by:
I CIN ( rms ) = I OUT ( max ) D ( 1 ? D )
The worse case occurs when the duty cycle D
is 50% and gives an RMS current value equal
to I OUT /2.
Select input capacitors with adequate ripple
current rating to ensure reliable operation. The
power dissipated in the input capacitor is:
R ESR ≤
Δ V OUT
I PP
P CIN = I 2 CIN ( rms ) R ESR ( CIN )
This can become a significant part of power
Δ V OUT = Peak to Peak Output Voltage Ripple
I PP = Peak to Peak Inductor Ripple Current
losses in a converter and hurt the overall
energy transfer efficiency. The input voltage
ripple primarily depends on the input capacitor
ESR and capacitance. Ignoring the inductor
ripple current, the input voltage ripple can be
determined by:
F S C IN V IN
The total output ripple is a combination of the
ESR and the output capacitance value and can
be calculated as follows:
Δ V IN = I OUT ( max ) R ESR ( CIN ) +
I OUT ( max ) V OUT ( V IN ? V OUT )
2
? I ( 1 ? D ) ?
= ? PP ? + ( I PP R ESR ) 2
Δ V OUT
Where:
? C OUT F S ?
2
The capacitor type suitable for the output
capacitors can also be used for the input
capacitors. However, exercise extra caution
when tantalum capacitors are considered.
Tantalum capacitors are known for
FS = Switching Frequency
D = Duty Cycle
C OUT = Output Capacitance Value
catastrophic failure when exposed to surge
current, and input capacitors are prone to
such surge current when power supplies are
connected “live” to low impedance power
sources.
? 2008 Exar Corporation
9/15
Rev. 2.0.0
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