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參數(shù)資料
| 型號(hào)： | 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)： | 21/32頁 |
| 文件大小： | 945K |
| 代理商： | MAX15003 |
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M
Triple-Output Buck Controller with
Tracking/Sequencing
______________________________________________________________________________________
21
Below are equations that define the power modulator:
The switching frequency is programmable between
200kHz and 2.2MHz using an external resistor at RT.
Typically, the crossover frequency (f
CO
), which is the
frequency when the system’s closed-loop gain is equal
to unity crosses the 0dB axis—should be set at or
below one-tenth the switching frequency (f
SW
/10) for
stable, closed-loop response.
The MAX15003 provides an internal transconductance
amplifier with its inverting input and its output available
to the user for external frequency compensation. The
flexibility of external compensation for each converter
offers wide selection of output filtering components,
especially the output capacitor. For cost-sensitive appli-
cations, use aluminum electrolytic capacitors and for
space-sensitive applications, use low-ESR tantalum or
multilayer ceramic chip (MLCC) capacitors at the out-
put. The higher switching frequencies of the MAX15003
allow the use of MLCC as the primary filter capacitor(s).
First, select the passive and active power components
that meet the application’s output ripple, component
size, and component cost requirements. Second,
choose the small-signal compensation components to
achieve the desired closed-loop frequency response
and phase margin as outlined below.
Closed-Loop Response and Compensation
of Voltage-Mode Regulators
The power modulator’s LC lowpass filter exhibits a vari-
ety of responses, depending on the value of the L and
C (and their parasitics).
One such response is shown in Figure 5a. In this example
the power modulator’s uncompensated crossover is
approximately 1/6
th
the desired crossover frequency,
f
CO
. Note also, the uncompensated roll-off through the
0dB plane follows the double-pole, -40dB/decade
slope and approaches 180° of phase shift, indicative of
a potentially unstable system. Together with the inher-
ent 180° of phase delay in the negative feedback
system, this may lead to near 360° or positive feed-
back—an unstable system.
The desired (compensated) roll-off follows a
-20dB/decade slope (and commensurate 90° of phase
shift), and, in this example, occurs at approximately 6x
the uncompensated crossover frequency, f
CO
. In this
example, a Type II compensator provides for stable
closed-loop operation, leveraging the +20dB/decade
slope of the capacitor’s ESR zero (see Figure 5b).
G
f
f
f
MOD DC
VIN
VRAMP
1
LC
L
COUT
1
×
ZEROESR
ESR COUT
ESR
ESL
2
π
×
ZEROESL
(
)
×
,
,
=
=
=
=
2
2
π
π
×
×
POWER MODULATOR (LARGE, BULK OUTPUT
CAPACITOR(S)) GAIN (REAL, ASYMPTOTIC/
PHASE RESPONSE vs. FREQUENCY
40
f
LC
M
P
-60
-40
-20
0
20
-80
100
1k
10k
FREQUENCY (Hz)
100k
1M
10M
10
-135
-90
-45
0
45
90
-180
|G
MOD
|
|G
MOD
|
f
ZERO,ESL
f
ZERO,ESR
< G
MOD
Figure 5a. Power Modulator Gain and Phase Response (Large,
Bulk COUT)
M
P
FREQUENCY (Hz)
-60
-40
-20
0
20
40
60
80
-80
-135
-90
-45
0
45
90
135
180
-180
POWER MODULATOR (LARGE, BULK OUTPUT
CAPACITOR(S)) AND TYPE II COMPENSATION GAIN
(ASYMPTOTIC)/PHASE RESPONSE vs. FREQUENCY
100
1k
10k
100k
1M
10M
10
<G
EA
|G
EA
|
f
LC
f
ZERO,ESR
f
ZERO,ESL
f
CO
< G
MOD
Figure 5b. Power Modulator (Large, Bulk COUT) and Type II
Compensator Responses
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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(píng)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(shí)間: 下降時(shí)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(shí)間: 下降時(shí)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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