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参数资料
| 型号： | MAX1634AEAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式，混合 |
| 输出数： | 2 |
| 频率 - 最大： | 330kHz |
| 占空比： | 99% |
| 电源电压： | 4.2 V ~ 30 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： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
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Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
Remote output-voltage sensing, while not possible in
fixed-output mode due to the combined nature of the
voltage-sense and current-sense inputs (CSL3 and
CSL5), is easy to do in adjustable mode by using the top
of the external resistor-divider as the remote sense point.
1-SHOT
SECFB
R2
When using adjustable mode, it is a good idea to
TRIG
R1
always set the “3.3V output” to a lower voltage than the
“5V output.” The 3.3V output must always be less than
VL, so that the voltage on CSH3 and CSL3 is within the
common-mode range of the current-sense inputs. While
2.5V REF
DH_
V+
POSITIVE
SECONDARY
OUTPUT
VL is nominally 5V, it can be as low as 4.7V when lin-
early regulating, and as low as 4.2V when automatically
bootstrapped to CSH5.
Secondary Feedback Regulation Loop
(SECFB or V DD )
A flyback-winding control loop regulates a secondary
MAX1631A
MAX1634A
DL_
MAIN
OUTPUT
(
winding output, improving cross-regulation when the
primary output is lightly loaded or when there is a low
R1
+V TRIP = V REF 1 + –––
R2
)
WHERE V REF (NOMINAL) = 2.5V
input-output differential voltage. If V DD or SECFB falls
below its regulation threshold, the low-side switch is
turned on for an extra 1μs. This reverses the inductor
(primary) current, pulling current from the output filter
Figure 5. Adjusting the Secondary Output Voltage with SECFB
capacitor and causing the flyback transformer to oper-
ate in forward mode. The low impedance presented by
12OUT
+12V OUTPUT
200mA
the transformer secondary in forward mode dumps cur-
rent into the secondary output, charging up the sec-
ondary capacitor and bringing V DD or SECFB back into
regulation. The secondary feedback loop does not
improve secondary output accuracy in normal flyback
V DD
0.1 μ F
0.1 μ F
10 Ω
2N3906
10 μ F
mode, where the main (primary) output is heavily
loaded. In this condition, secondary output accuracy is
determined by the secondary rectifier drop, transformer
turns ratio, and accuracy of the main output voltage. A
MAX1630A
MAX1632A
V+
0.1 μ F
V DD OUTPUT
linear postregulator may still be needed to meet strict
output-accuracy specifications.
MAX1633A
MAX1635A
DH_
2.2 μ F
Devices with a 12OUT linear regulator have a V DD pin
that regulates at a fixed 13.5V, set by an internal
resistor-divider. The MAX1631A/MAX1634A have an
adjustable secondary output voltage set by an external-
resistor-divider on SECFB (Figure 5). Ordinarily, the
secondary regulation point is set 5% to 10% below the
DL_
MAIN
OUTPUT
voltage normally produced by the flyback effect. For
example, if the output voltage as determined by turns
ratio is 15V, set the feedback resistor ratio to produce
13.5V. Otherwise, the SECFB one-shot might be trig-
gered unintentionally, unnecessarily increasing supply
current and output noise.
Figure 6. Increased 12V Linear Regulator Output Current
12V Linear Regulator Output
(MAX1630A/MAX1632A/
MAX1633A/MAX1635A)
The MAX1630A/MAX1632A/MAX1633A/MAX1635A
include a 12V linear regulator output capable of deliver-
ing 120mA of output current. Typically, greater current is
available at the expense of output accuracy. If an accu-
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1634CAI | 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 |
| MAX1634CAI+ | 功能描述:DC/DC 开关控制器 Multi-Out Low-Noise Power-Supply Ctlr 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 |
| MAX1634CAI+T | 功能描述:DC/DC 开关控制器 Multi-Out Low-Noise Power-Supply Ctlr 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 |
| MAX1634CAI-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 |
| MAX1634EAI | 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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