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參數(shù)資料
| 型號： | MAX15003 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Triple-Output Buck Controller with Tracking/Sequencing |
| 中文描述： | 三輸出buck控制器，提供跟蹤/排序功能 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 945K |
| 代理商： | MAX15003 |
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M
Triple-Output Buck Controller with
Tracking/Sequencing
18
______________________________________________________________________________________
PWM Controller
Design Procedures
Setting the Switching Frequency
Connect a 500k
to 45k
resistor from RT to SGND to
program the switching frequency from 200kHz to
2.2MHz. Calculate the switching frequency using the
following equation:
f
SW
= 10
11
/(R
RT
+ 1750)
Higher frequencies allow designs with lower inductor
values and less output capacitance. Consequently,
peak currents and I
2
R losses are lower at higher
switching frequencies, but core losses, gate-charge
currents, and switching losses increase.
Effective Input Voltage Range
Although the MAX15003 converters can operate from
input supplies ranging from 5.5V to 23V, the input volt-
age range can be effectively limited by the MAX15003
duty-cycle limitations for a given output voltage. The
maximum input voltage is limited by the minimum on-
time (t
ON(MIN)
):
where t
ON(MIN)
is 75ns.
The minimum input voltage is limited by the maximum
duty cycle and is calculated using the following equa-
tion:
where t
OFF(MIN)
typically is equal to 150ns.
Inductor Selection
Three key inductor parameters must be specified for
operation with the MAX15003: inductance value (L),
peak inductor current (I
PEAK
), and inductor saturation
current (I
SAT
). The minimum required inductance is a
function of operating frequency, input-to-output voltage
differential, and the peak-to-peak inductor current
(
I
P-P
). Higher
I
P-P
allows for a lower inductor value. A
lower inductance value minimizes size and cost and
improves large-signal and transient response.
However, efficiency is reduced due to higher peak cur-
rents and higher peak-to-peak output voltage ripple for
the same output capacitor. A higher inductance
increases efficiency by reducing the ripple current,
however resistive losses due to extra wire turns can
exceed the benefit gained from lower ripple current lev-
els especially when the inductance is increased without
also allowing for larger inductor dimensions. A good
rule of thumb is to choose
I
P-P
equal to 30% of the full
load current. Calculate the inductance using the follow-
ing equation:
V
IN
and V
OUT
are typical values so that efficiency is
optimum for typical conditions. The switching frequen-
cy is programmable between 200kHz and 2.2MHz (see
Oscillator/Synchronization Input/Phase Staggering (RT,
SYNC, PHASE) section). The peak-to-peak inductor
current, which reflects the peak-to-peak output ripple,
is worst at the maximum input voltage. See the Output
Capacitor Selection section to verify that the worst-case
output current ripple is acceptable. The inductor satu-
ration current (I
SAT
) is also important to avoid runaway
current during continuous output short-circuit condi-
tions. Select an inductor with an I
SAT
specification high-
er than the maximum peak current.
L
OUT
V
V
IN
OUT
V
I
IN
SW
f
P P
V
=
×
(
)
×
V
V
t
f
IN MIN
(
OUT
OFF MIN
(
SW
)
)
≥
×
(
)
1
V
V
t
f
IN MAX
(
OUT
ON MIN
(
SW
)
)
≤
×
CURRENT LIMIT
COUNT OF 8
N
CL
CLR
IN
INITIATE HICCUP
TIMEOUT
N
HT
COUNT OF 3
N
CLR
CLR
IN
Figure 3. Hiccup-Mode Block Diagram
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| MAX15003ATM+ | 功能描述:DC/DC 開關(guān)控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX15003ATM+T | 功能描述:DC/DC 開關(guān)控制器 Triple-Out Buck Ctlr w/Track/Sequence RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX15003EVKIT+ | 功能描述:電源管理IC開發(fā)工具 MAX15003 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX15004AAUE/V+ | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX15004AAUE/V+T | 功能描述:電流型 PWM 控制器 Flyback/Boost/SEPIC Power-Supply Ctlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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