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參數(shù)資料
| 型號： | MAX1964TEEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Tracking/Sequencing Triple/Quintuple Power-Supply Controllers |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁數(shù)： | 19/30頁 |
| 文件大?。?/td> | 475K |
| 代理商： | MAX1964TEEE |
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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:
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,
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 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
pole. The external inductor, high-side MOSFET, output
capacitor, compensation resistor, and compensation
capacitors determine the loop stability. The inductor
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:
V
I
ESR
V
I
C
I
V
V
L
V
V
RIPPLE ESR
P P
-
RIPPLE( )
P P
-
OUT SW
P P
-
IN
OUT
SW
OUT
IN
(
)
=
=
=
-
8
I
I
V
V
V
V
RMS
LOAD
OUT
IN
OUT
IN
=
(
)
M
Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
______________________________________________________________________________________
19
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1965TEEP | Tracking/Sequencing Triple/Quintuple Power-Supply Controllers |
| MAX1966 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1967EUB | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966-MAX1967 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966ESA | Low-Cost Voltage-Mode PWM Step-Down Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1964TEEE+ | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1964TEEE+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1964TEEE-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1965TEEP | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1965TEEP-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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