- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383155 > ISL6540A (Intersil Corporation) Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability PDF資料下載
參數(shù)資料
| 型號： | ISL6540A |
| 廠商： | Intersil Corporation |
| 英文描述： | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability |
| 中文描述： | 單相降壓PWM控制器，帶有集成的高速MOSFET驅(qū)動器和預(yù)偏置負(fù)載能力 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 430K |
| 代理商： | ISL6540A |
16
FN6288.2
March 12, 2007
current paths on the SS pin and locate the capacitor, C
SS
close to the SS pin (as described earlier) as the internal
current source is only 37
μ
A. Provide local decoupling
between PVCC and PGND pins as described earlier. Locate
the capacitor, C
BOOT
as close as practical to the BOOT and
PHASE pins.
Compensating the Converter
The ISL6540A single-phase converter is a voltage-mode
controller. This section highlights the design considerations for
a voltage-mode controller requiring external compensation. To
address a broad range of applications, a type-3 feedback
network is recommended (see Figure 9).
Figure 10 highlights the voltage-mode control loop for a
synchronous-rectified buck converter, when using an internal
differential remote sense amplifier. The output voltage
(V
OUT
) is regulated to the reference voltage, VREF, level.
The error amplifier output (COMP pin voltage) is compared
with the oscillator (OSC) triangle wave to provide a
pulse-width modulated wave with an amplitude of V
IN
at the
PHASE node. The PWM wave is smoothed by the output
filter (L and C). The output filter capacitor bank’s equivalent
series resistance is represented by the series resistor ESR.
The modulator transfer function is the small-signal transfer
function of V
OUT
/V
COMP
. This function is dominated by a
DC gain, given by D
MAX
V
IN
/V
OSC
, and shaped by the
output filter, with a double pole break frequency at F
LC
and a
zero at F
CE
. For the purpose of this analysis C and ESR
represent the total output capacitance and its equivalent
series resistance.
The compensation network consists of the error amplifier
(internal to the ISL6540A) and the external R
1
-R
3
, C
1
-C
3
components. The goal of the compensation network is to
provide a closed loop transfer function with high 0dB crossing
frequency (F
0
; typically 0.1 to 0.3 of F
SW
) and adequate
phase margin (better than 45°). Phase margin is the
difference between the closed loop phase at F
0dB
and 180°.
The equations that follow relate the compensation network’s
poles, zeros and gain to the components (R
1
, R
2
, R
3
, C
1
, C
2
,
and C
3
) in Figures 9 and 10. Use the following guidelines for
locating the poles and zeros of the compensation network:
1. Select a value for R
1
(1k
Ω
to 10k
Ω
, typically). Calculate
value for R
2
for desired converter bandwidth (F
0
). If
setting the output voltage to be equal to the reference set
voltage as shown in Figure 9, the design procedure can
be followed as presented. However, when setting the
output voltage via a resistor divider placed at the input of
the differential amplifier (as shown in Figure 10), in order
to compensate for the attenuation introduced by the
resistor divider, the below obtained R
2
value needs be
multiplied by a factor of (R
OS
+R
FB
)/R
OS
. The remainder
of the calculations remain unchanged, as long as the
compensated R
2
value is used.
A small capacitor,
C
SEN
in Figure 10, can be added to filter
out noise, typically
C
SEN
is chosen so the corresponding
time constant does not reduce the overall phase margin
of the design, typically this is 2x to 10x switching
frequency of the regulator. As the ISL6540A supports
100% duty cycle, d
MAX
equals 1. The ISL6540A also
uses feedforward compensation, as such V
OSC
is equal
FIGURE 9. COMPENSATION CONFIGURATION FOR
ISL6540A WHEN USING DIFFERENTIAL REMOTE
SENSE
ISL6540A
COMP
C
1
R
2
R
1
FB
VMON
C
2
R
3
C
3
F
LC
2
π
L C
---------------------------
=
F
CE
---------------------------------
=
FIGURE 10. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
-
+
E/A
VREF
COMP
C
1
R
2
R
1
FB
C
2
R
3
C
3
L
C
V
IN
PWM
CIRCUIT
HALF-BRIDGE
DRIVE
OSCILLATOR
ESR
EXTERNAL CIRCUIT
ISL6540A
V
OUT
V
OSC
DCR
UGATE
PHASE
LGATE
-
+
VMON
VSEN+
VSEN-
C
SEN
R
OS
R
FB
R
2
V
R
F
MAX
IN
LC
---------------------------------------------
=
ISL6540A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6540ACRZ | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability |
| ISL6540ACRZA | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability |
| ISL6540AIRZ | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability |
| ISL6540AIRZA | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability |
| ISL6545 | 5V or 12V Single Synchronous Buck Pulse-Width Modulation (PWM) Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6540ACRZ | 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 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:75 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.3 V ~ 13.5 V 降壓:是 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:0°C ~ 70°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:管件 產(chǎn)品目錄頁面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5 |
| ISL6540ACRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| ISL6540ACRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6540ACRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6540AIRZ | 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6540AIRZA | 功能描述:IC REG CTRLR BUCK PWM VM 28-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。