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参数资料
| 型号： | MAX742CWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 20-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 200kHz |
| 占空比： | 90% |
| 电源电压： | 4.2 V ~ 10 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NAME
FB+
CC+
AGND
AV+
100/200
12/15
VREF
SS
CC-
FB-
CSL-
CSH-
V+
EXT-
PDRV
PUMP
EXT+
GND
CSL+
CSH+
FUNCTION
Step-Up Feedback Input
Step-Up Compensation Capacitor
Analog Ground
Analog Supply Voltage Input (+5V)
Selects oscillator frequency. Ground for 200kHz, or tie to V+ for 100kHz.
Selects V OUT . Ground for ±15V, or tie to V+ for ±12V.
Reference Voltage Output (+2.00V). Force to GND or V+ to disable chip.
Soft-Start Timing Capacitor (sources 5μA)
Inverting Compensation Capacitor
Inverting Section Feedback Input
Current-Sense Low (inverting section)
Current-Sense High (inverting section)
Supply Voltage Input (+5V)
Push-Pull Output —drives external P-channel MOSFET.
Voltage Input —negative supply for P-channel MOSFET driver.
Charge-Pump Driver —clock output at 1/2 oscillator frequency.
Push-Pull Output —drives external logic-level N-channel MOSFET.
High-Current Ground
Current-Sense Low (step-up section)
Current-Sense High (step-up section)
________________Operating Principle
Each current-mode controller consists of a summing
amplifier that adds three signals: the current waveform
from the power switch FET, an output-voltage error sig-
nal, and a ramp signal for AC compensation generated
by the oscillator. The output of the summing amplifier
resets a flip-flop, which in turn activates the power FET
driver stage (Figure 1).
Both external transistor switches are synchronized to
the oscillator and turn on simultaneously when the flip-
flop is set. The switches turn off individually when their
source currents reach a trip threshold determined by
the output-voltage error signal. This creates a duty-
cycle modulated pulse train at the oscillator frequency,
where the on time is proportional to both the output-
voltage error signal and the peak inductor current. Low
peak currents or high output-voltage error signals result
in a high duty cycle (up to 90% maximum).
AC stability is enhanced by the internal ramp signal
applied to the error amplifier. This scheme eliminates
regenerative “staircasing” of the inductor current, which
is otherwise a problem when in continuous current
mode with greater than 50% duty cycle.
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX742EPP | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EPP+ | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EVKIT-SO | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EWP | 功能描述:直流/直流开关调节器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX742EWP/G0F | 制造商:Maxim Integrated Products 功能描述:SWITCH-MODE REGULATOR WITH 5V TO ?12 OR ?15V DUAL-OUTPUT - Rail/Tube |
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