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| 型号： | MAX1964TEEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC POWER CTRLR/SEQUENCER 16QSOP |
| 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，序列发生器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1.25mA |
| 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： | 带卷 (TR) |
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Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
I RMS = I LOAD
V OUT ( V IN ? V OUT )
V IN
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
I RMS has a maximum value when the input voltage
equals twice the output voltage (V IN = 2V OUT ), so
I RMS(MAX) = I LOAD /2. For most applications, nontanta-
lum capacitors (ceramic, aluminum, polymer, or OS-
CON) are preferred due to their robustness with high
inrush currents typical of systems with low impedance
inputs. Additionally, two (or more) smaller value low-
ESR capacitors can be connected in parallel for lower
cost. Choose an input capacitor that exhibits less than
+10 ° C temperature rise at the RMS input current for
optimal circuit long-term reliability.
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 equivalent series resis-
tance (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
capacitor in the 470μF range, in parallel with a 0.1μF
ceramic capacitor.
Since the MAX1964/MAX1965 use a current-mode con-
trol scheme, the output capacitor forms a pole that
affects circuit stability (see Compensation Design ).
Furthermore, the output capacitor ’ s ESR also forms a
zero.
The MAX1964/MAX1965 ’ s response to a load transient
depends on the selected output capacitor. After a load
transient, the output instantly changes by ESR x
? 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 applications that have strict transient
requirements, low-ESR high-capacitance electrolytic
capacitors are recommended to minimize the transient
voltage swing.
Do not exceed the capacitor ’ s voltage or ripple-current
ratings.
Compensation Design
The MAX1964/MAX1965 controllers use an internal
transconductance error amplifier whose output allows
compensation of the control loop. Connect a series
resistor and capacitor between COMP and GND to
form a pole-zero pair, and connect a second parallel
capacitor between COMP and GND to form another
V RIPPLE ( C ) =
I P - P
8 C OUT ? SW
pole. The external inductor, high-side MOSFET, output
capacitor, compensation resistor, and compensation
capacitors determine the loop stability. The inductor
I P - P = ? IN OUT ? ? OUT ?
? V - V ? ? V ?
? ? SW L ? ? V IN ?
where I p-p is the peak-to-peak inductor current (see
Inductor Selection section). These equations are suit-
able for initial capacitor selection, but final values
should be set by testing a prototype or evaluation cir-
cuit. As a general rule, a smaller ripple current results in
less output ripple. Since the inductor ripple current is a
factor of the inductor value and input voltage, the out-
put voltage ripple decreases with larger inductance,
but increases with lower input voltages.
With low-cost aluminum electrolytic capacitors, the
ESR-induced ripple can be larger than that caused by
the charge into and out of the capacitor. Consequently,
and output capacitor are chosen based on perfor-
mance, size, and cost, while the compensation resistor
and capacitors are selected to optimize control-loop
stability. The component values shown in the Standard
Application Circuit (Figures 1 and 6) yield stable opera-
tion 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
MAX1964/MAX1965 use the voltage across the high-
side MOSFET ’ s on-resistance (R DS(ON) ) to sense the
inductor current. Using the current-sense amplifier ’ s
output signal and the amplified feedback voltage, the
control loop determines the peak inductor current by:
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1965TEEP | 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 |
| MAX1965TEEP-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 |
| MAX1966ESA | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1966ESA+ | 功能描述:电压模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1966ESA+T | 功能描述:电压模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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