參數(shù)資料
型號： ISL6521IBZ
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： PWM Buck DC-DC and Triple Linear Power Controller
中文描述： SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, MS-012-AC, SOIC-16
文件頁數(shù)： 7/13頁
文件大?。?/td> 639K
代理商： ISL6521IBZ
7
The OC trip point varies with MOSFET’s 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
μ
A
V
DS(ON)
i
D
V
SET
R
OCSET
V
IN
= +5V
OVERCURRENT TRIP:
VDS
I
OCSET
+
+
FIGURE 3. OVERCURRENT DETECTION
PWM
DRIVE
iD
rDS ON
(
)
￥
IOCSET
ROCSET
￥
>
VSET
>
VPHASE
VOCSET
VIN
VIN
VDS
VSET
–
=
–
=
DRIVE3
FB3
FB4
C
OUT4
C
OUT3
Q3
ISL6521
V
OUT3
V
OUT4
+5V
IN
DRIVE4
R
S3
R
P3
R
S4
R
P4
VOUT
0.8
1
RP
+
×
=
FIGURE 4. ADJUSTING THE OUTPUT VOLTAGE OF ANY OF
THE FOUR REGULATORS (OUTPUTS 3 AND 4
PICTURED)
+
+
R
R
S
P
R
P
+
---------------------
5k
<
R
S
V
FB
---------------
R
FB
×
=
R
P
R
V
OUT
V
FB
–
--------------------------------
=
F
LC
L
O
2
π
C
O
×
×
---------------------------------------
=
F
ESR
2
π
ESR
C
O
×
×
-----------------------------------------
=
ISL6521
相關(guān)PDF資料
PDF描述
ISL6521IBZ-T PWM Buck DC-DC and Triple Linear Power Controller
ISL6522A Adjustable Precision Shunt Regulator 3-SOT-23 0 to 70
ISL6522ACB Adjustable Precision Shunt Regulator 3-SOT-23 0 to 70
ISL6522ACBZ Adjustable Precision Shunt Regulator 3-SOT-23 0 to 70
ISL6522ACBZ-T Adjustable Precision Shunt Regulator 3-SOT-89 0 to 70
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6521IBZ-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
ISL6522ACB 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6522ACB-T 功能描述:IC REG CTRLR BST PWM VM 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6522ACR 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6522ACR-T 功能描述:IC REG CTRLR BST PWM VM 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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