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| 型号： | MAX1864TEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
With low-cost aluminum electrolytic capacitors, the
ESR-induced ripple can be larger than that caused by
MAX1864
MAX1865
TO VL
BST
DH
LX
DH
R GATE
(OPTIONAL)
C BST
R GATE
(OPTIONAL)
N H
N L
L
the current into and out of the capacitor. Consequently,
high-quality low-ESR aluminum-electrolytic, tantalum,
polymer, or ceramic filter capacitors are required to
minimize output ripple. Best results at reasonable cost
are typically achieved with an aluminum-electrolytic
capacitor in the 470μF range, in parallel with a 0.1μF
ceramic capacitor.
Since the MAX1864/MAX1865 use a current-mode con-
trol scheme, the output capacitor forms a pole that
affects circuit stability (see Compensation Design ).
I P ? P
I P ? P = ? IN OUT ? ? OUT ?
GND
Figure 5. Reducing the Switching EMI
Output Capacitor
The key selection parameters for the output capacitor
are the actual capacitance value, the equivalent series
resistance (ESR), and voltage-rating requirements,
which affect the overall stability, output ripple voltage,
and transient response.
The output ripple has two components: variations in the
charge stored in the output capacitor, and the voltage
drop across the capacitor’s ESR caused by the current
into and out of the capacitor:
V RIPPLE = V RIPPLE ( ESR ) + V RIPPLE ( C )
The output voltage ripple as a consequence of the ESR
and output capacitance is:
V RIPPLE ( ESR ) = I P ? P ESR
V RIPPLE ( C ) =
2 C OUT ? SW
? V - V ? ? V ?
? ? SW L ? ? V IN ?
where I P-P is the peak-to-peak inductor current (see
Inductor Value section). These equations are suitable
for initial capacitor selection, but final values should be
set by testing a prototype or evaluation circuit. As a
general rule, a smaller ripple current results in less out-
put ripple. Since the inductor ripple current is a factor
of the inductor value and input voltage, the output volt-
age ripple decreases with larger inductance but
increases with lower input voltages.
Furthermore, the output capacitor’s ESR also forms a
zero.
The MAX1864/MAX1865s’ response to a load transient
depends on the selected output capacitor. After a load
transient, the output instantly changes by ESR ?
Δ I LOAD . Before the controller can respond, the output
will sag further, depending on the inductor and output
capacitor values.
After a short period of time (see Typical Operating
Characteristics ), the controller responds by regulating
the output voltage back to its nominal state. For appli-
cations that have strict transient requirements, low-ESR
high-capacitance electrolytic capacitors are recom-
mended to minimize the transient voltage swing.
Do not exceed the capacitor’s voltage or ripple-current
ratings.
Compensation Design
The MAX1864/MAX1865 controllers use an internal
transconductance error amplifier whose output com-
pensates the control loop. Connect a series resistor
and capacitor between COMP and GND to form a pole-
zero pair. The external inductor, high-side MOSFET,
output capacitor, compensation resistor, and compen-
sation capacitor determine the loop stability. The induc-
tor and output capacitor are chosen based on
performance, size, and cost. Additionally, the compen-
sation resistor and capacitor are selected to optimize
control-loop stability. The component values shown in
the standard application circuits (Figures 1 and 6) yield
stable operation over a broad range of input-to-output
voltages.
The controller uses a current-mode control scheme that
regulates the output voltage by forcing the required
current through the external inductor, so the
MAX1864/MAX1865 use the voltage across the high-
side MOSFET’s R DS(ON) to sense the inductor current.
Using the current-sense amplifier’s output signal and
the amplified feedback voltage, the control loop deter-
mines the peak inductor current by:
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1864TEEE+ | 功能描述:DC/DC 开关控制器 xDSL/Cable Modem Triple/Quint Output 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 |
| MAX1864TEEE+T | 功能描述:电流和电力监控器、调节器 xDSL/Cable Modem Triple/Quint Output 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 |
| MAX1864TEEE-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 |
| MAX1864UEEE | 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 |
| MAX1864UEEE-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 |
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