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| 型号： | LT1506IS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 4.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 4.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LT1506
APPLICATIO N S I N FOR M ATIO N
( 5 ) ( 10 ? 5 ) = 0 . 5 A
( )
10 ? ? 10 ? 10 ? ? ?? 500 ? 10 3 ??
I P-P =
= = 10 6
Σ
V RIPPLE = ( 0 . 5 A )( 0 . 1 ) + ?? 10 ? 10 ? ?? 10 6 ??
Ceramic Capacitors
Higher value, lower cost ceramic capacitors are now
available in smaller case sizes. These are ideal for input
bypassing because of their high ripple rating and tolerance
to turn-on surges. As output capacitors, caution must be
used. Solid tantalum capacitor’s ESR generates a loop
“zero” at 5kHz to 50kHz that is beneficial in giving accept-
able loop phase margin. Ceramic capacitors remain ca-
pacitive to beyond 300kHz and usually resonate with their
ESL before ESR becomes effective. When using ceramic
output capacitors, the loop compensation pole frequency
must be reduced by a typical factor of 10.
OUTPUT RIPPLE VOLTAGE
Figure 3 shows a typical output ripple voltage waveform
? 6
dI 10
dt 10 ? 10 ? 6
= 0 . 05 + 0 . 01 = 60 mV P-P
20mV/DIV
? 9
V OUT AT I OUT = 1A
V OUT AT I OUT = 50mA
for the LT1506. Ripple voltage is determined by the high
frequency impedance of the output capacitor, and ripple
current through the inductor. Peak-to-peak ripple current
0.5A/DIV
INDUCTOR CURRENT
AT I OUT = 1A
INDUCTOR CURRENT
through the inductor into the output capacitor is:
0.5 μ s/DIV
1374 F03
AT I OUT = 50mA
I P -P
=
( V OUT )( V IN ? V OUT )
( V IN )( L )( f )
Figure 3. LT1506 Ripple Voltage Waveform
CATCH DIODE
For high frequency switchers, the sum of ripple current
slew rates may also be relevant and can be calculated
from:
The suggested catch diode (D1) is a 1N5821 Schottky, or
its Motorola equivalent, MBR330. It is rated at 3A average
forward current and 30V reverse voltage. Typical forward
voltage is 0.5V at 3A. The diode conducts current only
= IN
Σ
dI
dt
V
L
during switch off time. Peak reverse voltage is equal to
regulator input voltage. Average forward current in normal
I OUT ( V IN ? V OUT )
I D ( AVG ) =
( )( ) ( )
V RIPPLE = I P-P ESR + ESL Σ
Peak-to-peakoutputripplevoltageisthesumofatriwave
created by peak-to-peak ripple current times ESR, and a
square wave created by parasitic inductance (ESL) and
ripple current slew rate. Capacitive reactance is assumed
to be small compared to ESR or ESL.
dI
dt
Example: with V IN =10V, V OUT = 5V, L = 10 μ H, ESR = 0.1 ? ,
ESL = 10nH:
operation can be calculated from:
V IN
This formula will not yield values higher than 3A with
maximum load current of 4.25A unless the ratio of input to
output voltage exceeds 3.4:1. The only reason to consider
a larger diode is the worst-case condition of a high input
voltage and overloaded (not shorted) output. Under short-
circuit conditions, foldback current limit will reduce diode
current to less than 2.6A, but if the output is overloaded
12
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| LT1507CN8#PBF | 功能描述:IC REG BUCK ADJ 1.5A 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
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