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參數(shù)資料
| 型號(hào)： | ISL6557 |
| 廠商： | Intersil Corporation |
| 英文描述： | PWM Controller with Wide Input Voltage Range 8-SOIC -20 to 85 |
| 中文描述： | 多相PWM控制器為核心電壓調(diào)節(jié) |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 532K |
| 代理商： | ISL6557 |
16
Switching frequency is determined by the selection of the
frequency-setting resistor,RT (see the figure
Typical
Application
on page 3). Figure 14 and Equation 26 are
provided to assist in the selecting the correct value for RT.
Input Capacitor Selection
The input capacitors are responsible for sourcing the ac
component of the input current flowing into the upper
MOSFETs. Their rms current capacity must be sufficient to
handle the ac component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
Figures 15, 16 and 17 can be used to determine the input-
capacitor rms current as of duty cycle, maximum sustained
output current (I
O
), and the ratio of the combined peak-to-
peak inductor current (I
L,PP
as defined in Eqation 1) to the
maximum sustained load current, I
O
. Figure 18 is provided
as a reference to demonstrate the dramatic reductions in
input-capacitor rms current upon the implementation of the
multiphase topology.
FIGURE 14. RT vs SWITCHING FREQUENCY
100
1000
10000
10
SWITCHING FREQUENCY (kHZ)
10
100
1000
R
)
RT
10
11.09
1.13
f
S
(
)
log
–
[
]
=
(EQ. 26)
0.3
0.1
0
0.2
I
R
/
O
)
FIGURE 15. NORMALIZED INPUT-CAPACITOR RMS
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE ( V
IN
/ V
O
)
I
L,PP
= 0
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
DUTY CYCLE ( V
IN
/ V
O
)
FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS
CURRENT vs DUTY CYCLE FOR 3-PHASE
CONVERTER
0
0.4
1.0
0.2
0.6
0.8
I
R
/
O
0.3
0.1
0
0.2
I
L,PP
= 0
I
L,PP
= 0.25 I
O
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
I
R
/
O
)
FIGURE 17. NORMALIZED INPUT-CAPACITOR RMS
CURRENT vs DUTY CYCLE FOR 4-PHASE
CONVERTER
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE ( V
IN
/ V
O
)
0.3
0.1
0
0.2
I
L,PP
= 0
I
L,PP
= 0.25 I
O
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
FIGURE 18. NORMALIZED INPUT-CAPACITOR RMS
CURRENT vs DUTY CYCLE FOR SINGLE-PHASE
CONVERTER
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE ( V
IN
/ V
O
)
I
R
/
O
0.6
0.2
0
0.4
I
L,PP
= 0
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
ISL6557
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6557 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6557ACB | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6557ACB-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-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) |
| ISL6557ACBZ | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC 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) |
| ISL6557ACBZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 24-SOIC 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) |
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