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參數(shù)資料
| 型號(hào)： | LSP3603TCAK |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大小： | 143K |
| 代理商： | LSP3603TCAK |
Liteon Semiconductor Corporation
LSP3603
1.2 MHZ, 300mA Synchronous Step-Up Converter
Rev1.0
5/7
APPLICATION INFORMATION
Setting the Output Voltage
Vout=1.23V
+
×
2
1
R
Table 1 list the resistor selection for output voltage
Setting
Table 1.Resistor selection for output voltage setting
Inductor Selection
Output Capacitor Selection
Iout=
η
×
L
f
2
D
Vin
-
Ipeak
(
)
D
-
1
×
Input Capacitor Selection
An external resistor divider is used to set the output
voltage. The output voltage of the switching
regulator (VOUT) is determined by the following
equation:
The high switching frequency of 1.2MHz allows for
small surface mount inductors. For most designs,
the LSP3603 operates with inductors of 4.7H to
10H.The equation below can help to select the
inductor, the maximum output current can be get by
this equation; where η is the efficiency, IPEAK is the
peak current limit, f is the switching frequency, L is
the inductance value and D is the duty cycle.
Larger inductors mean less inductor current ripple
and usually less output voltage ripple. Larger
inductors also mean more load power can be
delivered. But large inductors are also with large
profile and costly. The inductor ripple current is
typically set for 20% to 40% of the maximum
inductor current. When selecting an inductor, the
DC current rating must be high enough to avoid
saturation at peak current. For optimum load
transient and efficiency, the low DCR should be
selected. Table 2 lists some typical surface mount
inductors that meet target applications for the
LSP3603:
The output capacitor is required to keep the output
voltage ripple small and to ensure regulation loop
stability. A 2.2F to 10F output capacitor is sufficient
for most applications. If output capacitor is larger than
10F, a phase lead capacitor must be included to
maintain enough phase margin. The output capacitor
must have low impedance at the switching frequency.
Ceramic capacitors with X5R or X7R dielectrics are
recommended due to their low ESR and high ripple
current ratings.
The input capacitor reduces the surge current drawn
from the input and switching noise from the device. A
minimum 4.7F input capacitor is needed for most
applications. The input capacitor impedance at the
switching frequency should be less than input source
impedance to prevent high frequency switching current
passing to the input. A low ESR input capacitor sized
for maximum RMS current must be used. Ceramic
capacitors with X5R or X7R dielectrics are highly
recommended because of their low ESR and small
temperature coefficients.
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