參數(shù)資料
型號(hào)： SC411EVB
廠商： Semtech Corporation
英文描述： Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
中文描述： 同步降壓偽固定頻率電源控制器
文件頁數(shù)： 16/27頁
文件大?。?/td> 488K
代理商： SC411EVB
16
2007 Semtech Corp.
www.semtech.com
SC411
POWER MANAGEMENT
Application Information (Cont.)
I
VDDP
= gate drive operating current (A)
V
g
= gate drive voltage, typically 5V (V)
Q
g
= FET gate charge, from the FET datasheet (C)
f
= switching frequency (kHz)
VBST = boost pin voltage during t
ON
(V)
D
= duty cycle
Inserting the following values for VBAT
condition (since
this is the worst case condition for power dissipation in
the controller) as an example (VOUT = 1.2V),
T
A
θ
VCCA = VDDP = 5V
I
VCCA
= 1100
μ
A (data sheet maximum)
I
VDDP
= 150
μ
A (data sheet maximum)
V
g
= 5V
Q
g
= 60nC
f
= 266kHz
VBAT
(MIN)
= 8V
VBST
(MIN)
= VBAT
+VDDP = 13V
D
(MIN)
= 1.2/8 = 0.15
= 85°C
= 100°C/W
gives us,
W
088
.
15
.
10
1
13
10
266
10
60
5
10
150
+
5
10
1100
5
P
+
3
3
9
6
6
D
=
+
=
and,
C
8
93
100
088
.
85
T
J
°
=
+
=
As can be seen, the heating effects due to internal power
dissipation are practically negligible, thus requiring no
special thermal consideration during layout.
The Reference Design is shown in Figure on Page 17.
An additional design optimized for ef
fi
ciency and capable
of a higher load current of 10A is shown in Figure 11 on
Page 21.
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PDF描述
SC411MLTRT Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
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SC412AEVB Synchronous Buck Controller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC411MLTRT 制造商:Semtech Corporation 功能描述:Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
SC412A 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller
SC412A_1 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller
SC412AEVB 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller
SC412AMLTRT 功能描述:IC REG CTRLR BUCK PWM 16-MLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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