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參數(shù)資料
| 型號(hào)： | ISL8560 |
| 廠商： | Intersil Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DC/DC Power Switching Regulator |
| 中文描述： | DC/DC電源開(kāi)關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大小： | 1016K |
| 代理商： | ISL8560 |
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11
FN9244.6
September 18, 2007
Applications Information
Product Description
The ISL8560 is a non-synchronous, integrated FET 2A step-
down regulator which operates from an unregulated input of
9V to 60V. The output voltage is user-adjustable with a pair
of external resistors. Frequency of operation is adjustable
from 100kHz to 600kHz set by RTCT. An external signal with
higher frequency can be injected to SYNCH to synchronize
the controller.
The buck controller drives an internal N-Channel MOSFET
and requires an external diode to deliver load current up to
2A. A Schottky diode is recommended for improved
efficiency and performance over a standard diode. The
converter output is regulated down to 1.21V from an input
source.
The PWM control loop uses a single output voltage loop with
input voltage feed forward which simplifies feedback loop
compensation and rejects input voltage variation. External
feedback loop compensation allows flexibility in output filter
component selection.
The buck regulator is equipped with a lossless current limit
scheme. The current limit in the buck regulator is achieved by
monitoring the drain-to-source current of the internal switching
power MOSFET. The current limit threshold is internally set at
4.5A peak. Additional feature includes programable soft-start to
support proper start up of wide output capacitance range.
Start-Up and Shut-Down
When the EN pin is connected to a logic high, the ISL8560 is
in the shut-down mode. All the control circuitry and both
MOSFETs are off, and V
OUT
falls to zero. In this mode, the
total input current is less than 110μA.
When the EN pin is tied to GND, and V
IN
reaches
approximately 9V, the regulator begins to switch. The output
voltage is gradually increased to ensure proper soft-start
operation.
When the EN reaches logic LOW, the regulator repeats the
start-up procedure, including the soft-start function. Connect
a capacitor from SS pin to ground. This capacitor, along with
an internal 10
μ
A current source sets the soft-start interval of
the converter, t
SS
.
Operating Frequency
The ISL8560 can operate at switching frequencies from
100kHz to 600kHz. A resistor tied from the RTCT pin to VIN
and a capacitor from RTCT to GND are used to program the
switching frequency through the following equation.
Caution: When the ISL8560 is in disabled state, the voltage
across RTCT pin will reach V
IN
voltage. Make sure that the
voltage rating of the RTCT capacitor is rated as high as the
input voltage.
Output Voltage Selection
The output voltage of the regulator can be programmed via
an external resistor divider that is used to scale the output
voltage relative to the internal reference voltage and feed it
back to the inverting input of the error amplifier. Refer to
Figure 30.
The output voltage programming resistor, R
3
, will depend on
the value chosen for the feedback resistor and the desired
output voltage of the regulator. The value for the feedback
resistor is typically between 1k
Ω
and 10k
Ω
.
If the output voltage desired is 1.21V, then R
3
is left
unpopulated.
FIGURE 28. OUTPUT SHORT CIRCUIT
Typical Performance Curves
(Continued)
LX = 10V/DIV
V
OUT
= 2V/DIV
IL = 2A/DIV
PGOOD = 5V/DIV
C
SS
μ
F
[
]
8.3 t
SS
s
[ ]
≈
(EQ. 1)
C
1
nF
[
]
[
]
-----------------
OSC
]
------------------------------
0.3
–
=
(EQ. 2)
R
3
R
1.21V
×
OUT
V
=
(EQ. 3)
ISL8560
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| ISL8560EVAL2Z | 功能描述:EVALUATION BOARD FOR ISL8560 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL8560IRZ | 功能描述:IC REG BUCK SYNC ADJ 2A 20QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL8560IRZ-T | 功能描述:IC REG BUCK SYNC ADJ 2A 20QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
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