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參數(shù)資料
| 型號： | MAX1540AETJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator |
| 中文描述： | DUAL SWITCHING CONTROLLER, 620 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220-WHHD-2, TQFN-32 |
| 文件頁數(shù)： | 26/49頁 |
| 文件大?。?/td> | 794K |
| 代理商： | MAX1540AETJ |
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M
(I
OUT
< I
LOAD(SKIP)
), the output voltage has a DC regu-
lation level higher than the error-comparator threshold
by approximately 1.5% due to slope compensation.
Forced-PWM Mode
The low-noise forced-PWM mode disables the zero-
crossing comparator, which controls the low-side
switch on-time. This forces the low-side gate-drive
waveform to be constantly the complement of the high-
side gate-drive waveform, so the inductor current
reverses at light loads while DH_ maintains a duty fac-
tor of V
OUT_
/ V
IN
. The benefit of forced-PWM mode is
to keep the switching frequency fairly constant.
However, forced-PWM operation comes at a cost: the
no-load 5V bias current remains between 4mA to
40mA, depending on the external MOSFETs and
switching frequency.
Forced-PWM mode is most useful for reducing audio-
frequency noise, improving load-transient response,
and providing sink-current capability for dynamic out-
put-voltage adjustment. The MAX1541 uses forced-
PWM operation during all dynamic output-voltage
transitions (GATE transition detected) in order to ensure
fast, accurate transitions. Since forced-PWM operation
disables the zero-crossing comparator, the inductor
current reverses under light loads, quickly discharging
the output capacitors. FBLANK determines how long
the MAX1541 maintains forced-PWM operation—typi-
cally 220μs (FBLANK = V
CC
), 140μs (FBLANK = open
or GND), or 65μs (FBLANK = REF).
Current-Limit Protection (ILIM_)
Valley Current Limit
The current-limit circuit employs a unique “valley” cur-
rent-sensing algorithm that uses a current-sense resistor
between CSP_ and CSN_ as the current-sensing ele-
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
26
______________________________________________________________________________________
Figure 3. MAX1540A/MAX1541 PWM-Controller Functional Diagram
VALLEY CURRENT
LIMIT
ON-TIME
COMPUTE
V+
TON
OUT_
ERROR
AMP
SATURATION
LIMIT
S
R
Q
S
R
Q
DH DRIVER
1-SHOT
TRIG
Q
t
OFF(MIN)
1-SHOT
TRIG
Q
t
ON
ZERO
CROSSING
FAULT
PROTECTION
DL DRIVER
INT REF_
INT FB_
SLOPE COMP
CC1
*MAIN MAX1541
CONTROLLER (OUT1) ONLY
CC1
7R
R
G
m
= 80
A
V
Figure 4. Pulse-Skipping/Discontinuous Crossover Point
I
I
LOAD
= I
PEAK
/2
ON-TIME
0
TIME
I
PEAK
L
V
IN
- V
OUT
Δ
I
Δ
t
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1540AETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot 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 |
| MAX1540AETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot 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 |
| MAX1540ETJ | 功能描述:DC/DC 開關(guān)控制器 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 |
| MAX1540ETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr 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 |
| MAX1540ETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr 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 |
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