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參數(shù)資料
| 型號(hào)： | MAX5038AEAI33 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | JT 37C 37#22D SKT WALL RECP |
| 中文描述： | SWITCHING CONTROLLER, 525 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 5.30 MM, MO-150, SSOP-28 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大小： | 680K |
| 代理商： | MAX5038AEAI33 |
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M
Dual-Phase, Parallelable, Average-Current-Mode
Controllers
______________________________________________________________________________________
15
The outer voltage control loop consists of the differen-
tial amplifier (DIFF AMP), reference voltage, and VEA.
The unity-gain differential amplifier provides true differ-
ential remote sensing of the output voltage. The differ-
ential amplifier output connects to the inverting input
(EAN) of the VEA. The noninverting input of the VEA is
internally connected to an internal precision reference
voltage. The MAX5041A reference voltage is set to
+1.0V and the MAX5038A reference is set to the preset
output voltage. The VEA controls the two inner current
loops (Figures 3a and 3b). Use a resistive feedback
network to set the VEA gain as required by the adaptive
voltage-positioning circuit (see the
Adaptive Voltage
Positioning
section).
Current-Sense Amplifier
The differential current-sense amplifier (CA_) provides a
DC gain of 18. The maximum input offset voltage of the
current-sense amplifier is 1mV and the common-mode
voltage range is -0.3V to +3.6V. The current-sense ampli-
fier senses the voltage across a current-sense resistor.
Peak-Current Comparator
The peak-current comparator provides a path for fast
cycle-by-cycle current limit during extreme fault condi-
tions such as an output inductor malfunction (Figure 4).
Note that the average-current-limit threshold of 48mV
still limits the output current during short-circuit condi-
tions. To prevent inductor saturation, select an output
inductor with a saturation current specification greater
than the average current limit (48mV). Proper inductor
selection ensures that only extreme conditions trip the
peak-current comparator, such as a broken output
inductor. The 112mV voltage threshold for triggering
the peak-current limit is twice the full-scale average
current-limit voltage threshold. The peak-current com-
parator has a delay of only 260ns.
Current-Error Amplifier
Each phase of the MAX5038A/MAX5041A has a dedi-
cated transconductance current-error amplifier (CEA_)
with a typical g
m
of 550μS and 320μA output sink and
source current capability. The current-error amplifier
outputs, CLP1 and CLP2, serve as the inverting input to
the PWM comparator. CLP1 and CLP2 are externally
accessible to provide frequency compensation for the
inner current loops (Figures 3a and 3b). Compensate
CEA_ such that the inductor current down slope, which
becomes the up slope to the inverting input of the PWM
comparator, is less than the slope of the internally gen-
erated voltage ramp (see the
Compensation
section).
PWM Comparator and R-S Flip-Flop
The PWM comparator (CPWM) sets the duty cycle for
each cycle by comparing the output of the current-error
amplifier to a 2V
P-P
ramp. At the start of each clock
cycle, an R-S flip-flop resets and the high-side driver
(DH_) turns on. The comparator sets the flip-flop as
soon as the ramp voltage exceeds the CLP_ voltage,
thus terminating the ON cycle (Figure 4).
2 x f
s
(V/s)
RAMP
CLK
CSP_
CSN_
GM
IN
SHDN
CLP_
DRV_V
CC
BST_
DH_
LX_
DL_
PGND
A
V
= 18
PWM
COMPARATOR
PEAK-CURRENT
COMPARATOR
112mV
S
R
Q
Q
G
m
=
550
μ
S
Figure 4. Phase Circuit (Phase 1/Phase 2)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5038A | Dual-Phase. Parallelable. Average-Current-Mode Controllers |
| MAX5041A | Dual-Phase. Parallelable. Average-Current-Mode Controllers |
| MAX5038AEAI12 | Dual-Phase, Parallelable, Average-Current-Mode Controllers |
| MAX5038AEAI15 | Dual-Phase, Parallelable, Average-Current-Mode Controllers |
| MAX5038AEAI18 | Dual-Phase, Parallelable, Average-Current-Mode Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5038AEAI33+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5038AEAI33-T | 功能描述:電流型 PWM 控制器 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 |
| MAX5038EAI12 | 功能描述:電流型 PWM 控制器 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 |
| MAX5038EAI12+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5038EAI12-T | 功能描述:電流型 PWM 控制器 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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