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参数资料
| 型号： | MAX1761EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 428kHz |
| 电源电压： | 4.5 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Small, Dual, High-Efficiency
Buck Controller for Notebooks
V IN
V IN
VL
VL
LINEAR
REG
2V
V REF
REF
REF
C L
C REF
OUT1
C IN1
V+
ON1
MAX1761
V IN
C IN2
V IN
Q1
DH1
DL1
DRIVER
DH
DH
DH2
DRIVER
DH2
Q3
PWM
CONTROL
PWM
CONTROL
ZCC1
ZERO
BLOCK
BLOCK
ZERO
ZCC2
CS1
CROSSING
ILIM
CROSSING
ILIM
CS2
ILIM1
ILIM2
VOS
OUT1
L1
-0.1V
VL
VL
-0.1V
L2
OUT2
C OUT1
D1
Q2
DL1
DL1
DRIVER
DL
DL
DL2
DL2
DRIVER
Q4
D2
C OUT2
OUT1
OUT
OUT
OUT2
ON1
ON1
SHDN
SHDN
ON2
ON2
GND
Figure 2. Functional Diagram
On - Time = K ? ?
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
Table 3. On-Time One-Shot
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.
? V OUT_ + 0.1V ?
? V IN ?
DEVICE
OUT1
OUT2
K
( μ s)
2.857
4.000
MIN
(kHz)
318
227
TYP
(kHz)
350
250
MAX
(kHz)
428
278
The 0.1V offset term accounts for the expected drop
across the low-side MOSFET switch.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1761EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1761 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1762EUB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1762EUB+ | 功能描述:DC/DC 开关控制器 Step-Down Controller for Notebooks RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1762EUB+T | 功能描述:DC/DC 开关控制器 Step-Down Controller for Notebooks RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1762EUB-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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