- 您现在的位置：买卖IC网 > PDF目录1837 > MAX1541ETL+T (Maxim Integrated Products)IC REG CTRLR DIVIDER PWM 40-TQFN PDF资料下载
参数资料
| 型号： | MAX1541ETL+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 40-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： | 2 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： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页
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
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1542ETP+T | IC DC-DC CONV TFT-LCD 20-TQFN |
| MAX1544ETL+ | IC QUICK-PWM DUAL-PHASE 40-TQFN |
| MAX1545ETL+ | IC QUICK-PWM DUAL-PHASE 40-TQFN |
| MAX1551EZK+T | IC BATT CHRGR LI+ 1CELL SOT23-5 |
| MAX1556ETB/V+T | IC REG BUCK SYNC ADJ 1.2A 10TDFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1541EVKIT | 制造商:Maxim Integrated Products 功能描述:DUAL STEP-DOWN CONTROLLERS W. SATURATION PROT - Bulk |
| MAX15425EVKIT# | 功能描述:显示开发工具 Eval Kit for the MAX15425 (Intel CPU Controller) RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX1542ETP | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1542ETP+ | 功能描述:LCD 驱动器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX1542ETP+T | 功能描述:LCD 驱动器 TFT LCD DC/DC Conv w/Op Amps RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。