參數(shù)資料
型號： MAX1761EEE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Replaced by TMS320VC5506 : Digital Signal Processor 100-LQFP
中文描述： SWITCHING CONTROLLER, 428 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-16
文件頁數(shù)： 11/23頁
文件大小： 473K
代理商： MAX1761EEE
M
Small, Dual, High-Efficiency
Buck Controller for Notebooks
______________________________________________________________________________________
11
On-Time One-Shot
The heart of the PWM core is the one-shot that sets the
high-side switch on-time for both controllers. This fast,
low-jitter, adjustable one-shot includes circuitry that
varies the on-time in response to battery and output
voltage. The high-side switch on-time is inversely pro-
portional to the battery voltage as measured by the V+
input, and proportional to the output voltage. This algo-
rithm results in a nearly constant switching frequency
despite the absence of a fixed-frequency clock genera-
tor. The benefits of a constant switching frequency are
twofold: first, the switching noise occurs at a known fre-
quency and is easily filtered; second, the inductor rip-
ple current remains relatively constant, resulting in
predictable output voltage ripple and a relatively sim-
ple design procedure. The difference in frequencies
between OUT1 and OUT2 prevents audio-frequency
“
beating
”
and minimizes crosstalk between the two
SMPS. The on-times can be calculated by using the
equation below that references the K values listed in
Table 3.
The 0.1V offset term accounts for the expected drop
across the low-side MOSFET switch.
On- Time = K
V
+ 0.1V
V
OUT_
IN
OUT1
OUT2
ON1
ON2
C
IN1
C
IN2
DL1
DL2
DL1
DL2
ZCC1
ZCC2
ILIM1
ILIM2
VOS
-0.1V
Q2
Q4
Q1
Q3
D1
D2
L1
L2
C
OUT1
C
OUT2
-0.1V
PWM
CONTROL
BLOCK
ZERO
CROSSING
PWM
CONTROL
BLOCK
LINEAR
REG
2V
V
REF
MAX1761
OUT1
VL
DH1
DH2
DH
DH
DL
DL
OUT
OUT
GND
SHDN
V+
VL
REF
CS1
CS2
ILIM
ILIM
ZERO
CROSSING
DL1
DH2
ON1
DRIVER
DRIVER
DRIVER
DRIVER
OUT1
V
IN
V
IN
C
L
C
REF
VL
V
IN
ON1
SHDN
V
IN
VL
REF
OUT2
ON2
Figure 2. Functional Diagram
Table 3. On-Time One-Shot
DEVICE
K
(
μ
s)
2.857
4.000
MIN
(kHz)
318
227
TYP
(kHz)
350
250
MAX
(kHz)
428
278
OUT1
OUT2
相關(guān)PDF資料
PDF描述
MAX1763 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763EEE 1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
MAX1763EUE Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85
MAX1765 Replaced by TMS320C6410 : Digital Signal Processors 68-PLCC -40 to 85
MAX1765EEE 800mA, Low-Noise, Step-Up DC-DC Converter with 500mA Linear Regulator
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1761EEE+ 功能描述:DC/DC 開關(guān)控制器 Dual Buck Controller 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
MAX1761EEE+T 功能描述:DC/DC 開關(guān)控制器 Dual Buck Controller 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
MAX1761EEE-T 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
MAX1761EVKIT 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1761 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
MAX1762EUB 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
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