參數(shù)資料
型號(hào)： ISL6567
廠(chǎng)商： Intersil Corporation
英文描述： Dual Low-Noise Wide-Bandwidth Precision Amplifier 8-SOIC -40 to 85
中文描述： 多用途兩相降壓PWM控制器集成MOSFET驅(qū)動(dòng)器
文件頁(yè)數(shù)： 19/26頁(yè)
文件大?。?/td> 659K
代理商： ISL6567
19
be added to offset some of the power dissipation in Q1, but it
also reduces the available V
CE
for Q1. If utilizing such a
series resistor, check that it does not impede on the proper
operation at the lowest input voltage and choose a power
rating corresponding to the highest bias current that the
ISL6567 may require to drive the switching MOSFETs.
FREQUENCY COMPENSATION
The ISL6567 multi-phase converter behaves in a similar
manner to a voltage-mode controller. This section highlights
the design consideration for a voltage-mode controller requiring
external compensation. To address a broad range of
applications, a type-3 feedback network is recommended
(see Figure 23).
Figure 24 highlights the voltage-mode control loop for a
synchronous-rectified buck converter, applicable, with a small
number of adjustments, to the multi-phase ISL6567 circuit. 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) modified saw-tooth 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 E.
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, L and D represent the
individual channel inductance and its DCR divided by 2
(equivalent parallel value of the two output inductors), while C
and E represents the total output capacitance and its
equivalent series resistance.
The compensation network consists of the error amplifier
(internal to the ISL6567) and the external R1-R3, C1-C3
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 degrees). Phase margin is the difference
between the closed loop phase at F
0dB
and 180
o
. The
equations that follow relate the compensation network’s poles,
FIGURE 22. INTERNAL SHUNT REGULATOR USE WITH
EXTERNAL NPN TRANSISTOR (ACTIVE
CONFIGURATION)
-
+
EXTERNAL CIRCUIT
ISL6567
E/A
POR
CIRCUIT
VREG
R1
V
IN
VREF
VCC
PVCC
R2
Q1
(optional)
SHUNT REGULATOR
FIGURE 23. COMPENSATION CONFIGURATION FOR ISL6567
CIRCUIT
ISL6567
COMP
C1
R2
R1
FB
V
DIFF
(V
OUT
)
C2
R3
C3
FIGURE 24. VOLTAGE-MODE BUCK CONVERTER
COMPENSATION DESIGN
-
+
E/A
VREF
COMP
C1
R2
R1
FB
C2
R3
C3
L
C
V
IN
PWM
CIRCUIT
HALF-BRIDGE
DRIVE
OSCILLATOR
E
EXTERNAL CIRCUIT
ISL6567
V
OUT
V
OSC
D
UGATE
PHASE
LGATE
-
+
VDIFF
VSEN
RGND
Ro
F
LC
2
π
L C
---------------------------
=
F
CE
-----------------------
=
ISL6567
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6567CRZ 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類(lèi)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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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)
ISL6567CRZ-T 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類(lèi)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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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)
ISL6567IRZ 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類(lèi)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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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)
ISL6567IRZS2698 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類(lèi)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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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)
ISL6567IRZ-T 功能描述:IC REG CTRLR BUCK PWM VM 24-QFN RoHS:是 類(lèi)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(wú) 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 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)
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