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參數(shù)資料
| 型號： | LT1959C |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 292K |
| 代理商： | LT1959C |
12
LT1959
APPLICATIO
S I
N
FOR
ATIO
U
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.
W
U
OUTPUT RIPPLE VOLTAGE
Figure 3 shows a typical output ripple voltage waveform
for the LT1959. Ripple voltage is determined by the high
frequency impedance of the output capacitor, and ripple
current through the inductor. Peak-to-peak ripple current
through the inductor into the output capacitor is:
)
( )( )( )
I
V
V
V
V
L f
P
OUT
IN
OUT
IN
-P
=
(
(
)
For high frequency switchers, the sum of ripple current
slew rates may also be relevant and can be calculated
from:
Σ
dI
dt
V
L
IN
=
Peak-to-peak output ripple voltage is the sum of a triwave
created by peak-to-peak ripple current times ESR, and a
squarewave created by parasitic inductance (ESL) and
ripple current slew rate. Capacitive reactance is assumed
to be small compared to ESR or ESL.
V
I
ESR
ESL
dI
dt
RIPPLE
=
( )(
)
+
(
)
P-P
Σ
Example: with V
IN
=10V, V
OUT
= 5V, L = 10
μ
H, ESR = 0.1
,
ESL = 10nH:
I
A
dI
dt
V
A
mV
RIPPLE
P-P
P-P
=
( )
(
)
( )
10
=
=
=
=
(
)( )
+
=
5 10 5
10 10 10
500 10
0 5
.
10 10
10
0 5
.
0 1
.
10 10
10
0 05 0 01 60
.
6
3
6
6
9
6
.
Σ
V
OUT
AT I
OUT
= 1A
V
OUT
AT I
OUT
= 50mA
INDUCTOR CURRENT
AT I
OUT
= 1A
0.5
μ
s/DIV
1374 F03
INDUCTOR CURRENT
AT I
OUT
= 50mA
20mV/DIV
0.5A/DIV
Figure 3. LT1959 Ripple Voltage Waveform
CATCH DIODE
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
during switch off time. Peak reverse voltage is equal to
regulator input voltage. Average forward current in normal
operation can be calculated from:
(
I
I
V
V
V
D AVG
OUT
IN
OUT
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
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| LT1959CR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959CR#PBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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