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参数资料
| 型号： | MAX1865TEEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 20QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1.4mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
INPUT
D1
CENTRAL CMPSH-3
9V TO 18V
NL, NH: INTERNATIONAL RECTIFIER
IRF7303
Q1: TIP30
Q2: 2N3905
C IN
470 μ F
C1
1 μ F
IN
BST
DH
R DH
10 Ω
N H
C2
1 μ F
VL
ILIM
LX
DL
C BST
0.1 μ F
R DL
10 Ω
N L
T1
1
V OUT = 3.3V
1A
C OUT
470 μ F
R POK
100k Ω
MAX1864
OUT
POK
GND
C BE2
FB
2200pF
R COMP
47k Ω
C COMP
8.2nF
COMP
B2
FB2
R BE2
220 Ω
R1
10k Ω
R2
10k Ω
Q1
C4
10 μ F
C3
10 μ F
V OUT2 = 2.5V
300mA
T1
D2
C BE3
4700pF
NIHON EP05Q03L
B3
R BE3
220 Ω
R3
30k Ω
Q2
C6
10 μ F
C5
470 μ F
FB3
Figure 1. Standard MAX1864 Application Circuit
R4
10k Ω
C7
10 μ F
V OUT3 = 5.0V
100mA
the voltage across the load. Under overload conditions,
when the inductor current exceeds the selected cur-
rent-limit (see the Setting the Current Limit section), the
high-side MOSFET is not turned on at the rising edge of
the clock and the low-side MOSFET remains on to let
the inductor current ramp down.
The MAX1864/MAX1865 operate in a forced-PWM
mode, so even under light loads the controller main-
tains a constant switching frequency to minimize cross-
regulation errors in applications that use a transformer.
The low-side gate-drive waveform is the complement of
the high-side gate-drive waveform, which causes the
inductor current to reverse under light loads.
Current-Sense Amplifier
The MAX1864/MAX1865s’ current-sense circuit ampli-
fies (A V = 5) the current-sense voltage generated by
the high-side MOSFET ’s on-resistance (R DS(ON) ?
I INDUCTOR ). This amplified current-sense signal and
the internal slope compensation signal are summed
together (V SUM ) and fed into the PWM comparator’s
inverting input. The PWM comparator turns-off the high-
side MOSFET when V SUM exceeds the integrated feed-
back voltage (V COMP) . Place the high-side MOSFET no
further than 5mm from the controller, and connect IN
and LX to the MOSFET using Kelvin sense connections
to guarantee current-sense accuracy and improve
stability.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1865UEEP | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1865UEEP-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1868EGL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1868ETL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1869EGL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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