参数资料
| 型号： | ADP1611ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.2A 8MSOP |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 20V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 700kHz，1.23MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | ADP1611ARMZ-R7DKR |
ADP1611
DIODE SELECTION
The regulator loop gain is
The output rectifier conducts the inductor current to the output
capacitor and load while the switch is off. For high efficiency,
minimize the forward voltage drop of the diode. For this reason,
A VL =
V FB
V OUT
×
V IN
V OUT
× G MEA × Z COMP × G CS × Z OUT
(12)
Schottky rectifiers are recommended. However, for high
voltage, high temperature applications where the Schottky
rectifier reverse leakage current becomes significant and can
degrade efficiency, use an ultrafast junction diode.
Make sure that the diode is rated to handle the average output
load current. Many diode manufacturers derate the current
capability of the diode as a function of the duty cycle. Verify
that the output diode is rated to handle the average output load
current with the minimum duty cycle. The minimum duty cycle
of the ADP1611 is
where:
A VL is the loop gain.
V FB is the feedback regulation voltage, 1.230 V.
V OUT is the regulated output voltage.
V IN is the input voltage.
G MEA is the error amplifier transconductance gain.
Z COMP is the impedance of the series RC network from COMP to
GND.
G CS is the current-sense transconductance gain (the inductor
current divided by the voltage at COMP), which is internally set
by the ADP1611.
D MIN =
V OUT ? V IN ? MAX
V OUT
(10)
Z OUT is the impedance of the load and output capacitor.
To determine the crossover frequency, it is important to note
where V IN-MAX is the maximum input voltage.
that, at that frequency, the compensation impedance (Z COMP ) is
dominated by the resistor, and the output impedance (Z OUT ) is
Table 6. Schottky Diode Manufacturers
Vendor Phone No.
On Semiconductor 602-244-6600
Web Address
www.onsemi.com
dominated by the impedance of the output capacitor. So, when
solving for the crossover frequency, the equation (by definition
of the crossover frequency) is simplified to
| A
FB ×
OUT
IN × G
V
× R
× G
2 π × f × C
Diodes, Inc.
Central Semiconductor
Sanyo
805-446-4800
631-435-1110
310-322-3331
www.centralsemi.com
www.sanyo.com
VL
| =
V
V
V
OUT
MEA
COMP
CS
×
1
C OUT
= 1
(13)
where f C is the crossover frequency and R COMP is the
LOOP COMPENSATION
The ADP1611 uses external components to compensate the
compensation resistor.
Solving for R COMP
regulator loop, allowing optimization of the loop dynamics for a
given application.
R COMP =
2 π × f C × C OUT × V OUT × V OUT
V FB × V IN × G MEA × G CS
(14)
The step-up converter produces an undesirable right-half plane
zero in the regulation feedback loop. This requires compen-
For V FB = 1.23, G MEA = 100 μS, and G CS = 2 S
sating the regulator such that the crossover frequency occurs
well below the frequency of the right-half plane zero. The right-
half plane zero is determined by the following equation:
R COMP =
2 . 55 × 10 4 × f C × C OUT × V OUT × V OUT
V IN
(15)
F Z ( RHP ) = ? ?
?
? ×
?
? V IN
? V OUT
?
2
R LOAD
2 π × L
(11)
Once the compensation resistor is known, set the zero formed
by the compensation capacitor and resistor to one-fourth of the
crossover frequency, or
where:
F Z (RHP) is the right-half plane zero.
R LOAD is the equivalent load resistance or the output voltage
C COMP =
2
π × f C × R COMP
(16)
divided by the load current.
To stabilize the regulator, ensure that the regulator crossover
frequency is less than or equal to one-fifth of the right-half
plane zero and less than or equal to one-fifteenth of the
switching frequency.
where C COMP is the compensation capacitor.
The capacitor, C2, is chosen to cancel the zero introduced by
output capacitance ESR.
Solving for C2,
Rev. 0 | Page 12 of 20
C2 =
ESR × C OUT
R COMP
(17)
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