參數(shù)資料
型號(hào)： ISL6521CBZS2698
廠商： Intersil
文件頁數(shù)： 7/13頁
文件大?。?/td> 639K
描述： IC REG QD BCK/LINEAR 16-SOIC
標(biāo)準(zhǔn)包裝： 480
拓?fù)洌?/td> 降壓（降壓）同步（1），線性（LDO）（3）
功能： 任何功能
輸出數(shù)： 4
頻率 - 開關(guān)： 300kHz
電壓/電流 - 輸出 1： 控制器
電壓/電流 - 輸出 2： 可調(diào)式，120mA
電壓/電流 - 輸出 3： 可調(diào)式，120mA
帶 LED 驅(qū)動(dòng)器： 無
帶監(jiān)控器： 無
帶序列發(fā)生器： 無
電源電壓： 4.5 V ~ 5.5 V
工作溫度： 0°C ~ 70°C
安裝類型： *
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： *
包裝： 管件
7
The OC trip point varies with MOSFETs r
DS(ON)
 
temperature variations. To avoid overcurrent tripping in the
normal operating load range, determine the R
OCSET
 
resistor from the equation above with:
1. The maximum r
DS(ON)
 at the highest junction temperature.
2. The minimum I
OCSET
 from the specification table.
3. Determine I
PEAK
 for I
PEAK
 > I
OUT(MAX)
 + (I) / 2, where
I is the output inductor ripple current.
For an equation for the ripple current see the section under
component guidelines titled Output Inductor Selection.
Output Voltage Selection
The output voltage of the PWM converter can be resistor-
programmed to any level between V
IN
 and 0.8V . However,
since the value of R
S1
 is affecting the values of the rest of
the compensation components, it is advisable its value is
kept between 2k& and 5k&.
Output voltage selection on the linear regulators is set by
means of external resistor dividers as shown in Figure 4.
The two resistors used to set the voltage on each of the
three linear regulators have to meet the following criteria:
their value while in a parallel connection has to be less than
5k&, or otherwise said, the following relationship has to be
met:
To ensure the parallel combination of the feedback resistors
equals a certain chosen value, R
FB
, use the following
equations:
, where
V
OUT
 - the desired output voltage,
V
FB
 - feedback (reference) voltage, 0.8V.
Application Guidelines
Soft-Start Interval
The soft-start function controls the output voltages rate of rise
to limit the current surge at start-up. The soft-start function is
integrated on the chip and the soft-start interval is fixed.
PWM Controller Feedback Compensation
The PWM controller uses voltage-mode control for output
regulation. This section highlights the design consideration
for a PWM voltage-mode controller. Apply the methods and
considerations only to the PWM controller.
Figure 5 highlights the voltage-mode control loop for a
synchronous-rectified buck converter. The output voltage
(V
OUT
) is regulated to the reference voltage level, 0.8V. The
error amplifier (Error Amp) output (V
E/A
) is compared with
the oscillator (OSC) triangular wave to provide a pulse-width
modulated (PWM) wave with an amplitude of V
IN
 at the
PHASE node. The PWM wave is smoothed by the output
filter (L
O
 and C
O
).
The modulator transfer function is the small-signal transfer
function of V
OUT
/V
E/A
 . This function is dominated by a DC
Gain, given by V
IN
/V
OSC
 , and shaped by the output filter,
with a double pole break frequency at F
LC
 and a zero at
F
ESR
 .
Modulator Break Frequency Equations
The compensation network consists of the error amplifier
(internal to the ISL6521) and the impedance networks Z
IN
 
UGATE
OCSET
PHASE
OCC
+
-
GATE
CONTROL
VCC
OC
40?/SPAN>A
V
DS(ON)
i
D
V
SET
R
OCSET
V
IN
 = +5V
OVERCURRENT TRIP:
I
OCSET
+
+
FIGURE 3. OVERCURRENT DETECTION
PWM
DRIVE
i
D
r
DS ON
(  )
?/DIV>
I
OCSET
R
OCSET
?/DIV>
>
V
DS
V
SET
>
V
PHASE
V
IN
V
DS

=
V
OCSET
V
IN
V
SET

=
DRIVE3
FB3
FB4
C
OUT4
C
OUT3
Q3
ISL6521
V
OUT3
V
OUT4
+5V
IN
DRIVE4
R
S3
R
P3
R
S4
R
P4
V
OUT
0.8  1
R
S
R
P
--------
+
?nbsp   ?/DIV>
?nbsp   ?/DIV>
?nbsp   ?/DIV>
?/DIV>
=
FIGURE 4. ADJUSTING THE OUTPUT VOLTAGE OF ANY OF
THE FOUR REGULATORS (OUTPUTS 3 AND 4
PICTURED)
+
+
R
S
R
P
?/DIV>
R
S
R
P
+
---------------------- 5k&
<
R
S
V
OUT
V
FB
----------------
R
FB
?/DIV>
=
R
P
R
S
V
FB
?/DIV>
V
OUT
V
FB

---------------------------------
=
F
LC
1
2?nbsp L
O
C
O
?/DIV>
?/DIV>
----------------------------------------
=
F
ESR
1
2?ESR C
O
?/DIV>
?/DIV>
-----------------------------------------
=
ISL6521
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參數(shù)描述
ISL6521CBZ-T 功能描述:電壓模式 PWM 控制器 4 IN 1 PWM/LINEAR CNTRLR 5V RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
ISL6521CBZ-TS2698 功能描述:IC REG QD BCK/LINEAR 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
ISL6521EVAL1 功能描述:EVALUATION BOARD 1 ISL6521 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號(hào) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
ISL6521EVAL1Z 功能描述:EVALUATION BOARD 1 ISL6521 RoHS:是 類別:編程器，開發(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 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
ISL6521IBZ 功能描述:電壓模式 PWM 控制器 4 IN 1 PWM/LINEAR CNTRLR 5V RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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