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参数资料
| 型号： | MAX1540AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/49页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 32-TQFN |
| 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： | 620kHz |
| 占空比： | 100% |
| 电源电压： | 5.5 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
*MAIN MAX1541
CONTROLLER (OUT1) ONLY
INT FB_
CC1 CC1
R
ERROR
AMP
SLOPE COMP
INT REF_
A
G m = 80 V
7R
Q
t OFF(MIN)
TRIG
1-SHOT
VALLEY CURRENT
S
LIMIT
R
Q
DH DRIVER
t ON
SATURATION
LIMIT
Q
TRIG
1-SHOT
S
DL DRIVER
V+
TON
ON-TIME
COMPUTE
R
Q
FAULT
PROTECTION
OUT_
ZERO
CROSSING
Figure 3. MAX1540A/MAX1541 PWM-Controller Functional Diagram
reverses at light loads while DH_ maintains a duty fac-
Δ I
Δ t
=
V IN - V OUT
L
I PEAK
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.
I LOAD = I PEAK /2
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
0
ON-TIME
TIME
transitions (GATE transition detected) in order to ensure
fast, accurate transitions. Since forced-PWM operation
Figure 4. Pulse-Skipping/Discontinuous Crossover Point
(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
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-
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1540ETJ | 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 |
| MAX1540ETJ+ | 功能描述:DC/DC 开关控制器 Dual Step-Down 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 |
| MAX1540ETJ+T | 功能描述:DC/DC 开关控制器 Dual Step-Down 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 |
| MAX1540ETJ-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 |
| MAX1540EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1540 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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