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參數(shù)資料
| 型號(hào)： | IRU3138 |
| 廠商： | International Rectifier |
| 英文描述： | SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| 中文描述： | 同步PWM控制器終止電源應(yīng)用 |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 281K |
| 代理商： | IRU3138 |
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IRU3138
9
Rev. 1.0
01/29/04
www.irf.com
Choose IRLR3715Z for control MOSFET and IRFR3711Z
for synchronous MOSFET. These devices provide low
on-resistance in a D-Pak.
The MOSFETs have the following data:
The total conduction losses will be:
P
CON(TOTAL)
= P
CON(UPPER)
+ P
CON(LOWER)
P
CON(TOTAL)
= 1.77W
The switching loss is more difficult to calculate, even
though the switching transition is well understood. The
reason is the effect of the parasitic components and
switching times during the switching procedures such
as turn-on / turnoff delays and rise and fall times. The
control MOSFET contributes to the majority of the switch-
ing losses in synchronous Buck converter. The synchro-
nous MOSFET turns on under zero voltage conditions,
therefore, the turn on losses for synchronous MOSFET
can be neglected. With a linear approximation, the total
switching loss can be expressed as:
V
2
T
The switching time waveform is shown in Figure 7.
Figure 7 - Switching time waveforms.
From IRFR3711Z data sheet we obtain:
These values are taken under a certain condition test.
For more details please refer to the IRFR3711Z datasheet.
By using equation (12), we can calculate the total switch-
ing losses.
P
SW(TOTAL)
= 336mW
Feedback Compensation
The IRU3138 is a voltage mode controller; the control
loop is a single voltage feedback path including error
amplifier and error comparator. To achieve fast transient
response and accurate output regulation, a compensa-
tion circuit is necessary. The goal of the compensation
network is to provide a closed loop transfer function with
the highest 0dB crossing frequency and adequate phase
margin (greater than 45
8
).
The output LC filter introduces a double pole, –40dB/
decade gain slope above its corner resonant frequency,
and a total phase lag of 180
8
(see Figure 8). The Reso-
nant frequency of the LC filter is expressed as follows:
1
2
π×
L
O
×
C
O
Figure 9 shows gain and phase of the LC filter. Since we
already have 180
8
phase shift just from the output filter,
the system risks being unstable.
Figure 8 - Gain and phase of LC filter.
Where:
V
DS(OFF)
= Drain to Source Voltage at off time
t
r
= Rise Time
t
f
= Fall Time
T = Switching Period
I
LOAD
= Load Current
P
SW
=
I
LOAD
---(12)
×
t
r
+
t
f
×
IRFR3711Z
t
r
= 13ns
t
f
= 15ns
F
LC
= ---(13)
V
DS
90%
V
GS
10%
t
d
(ON)
t
d
(OFF)
t
r
t
f
Gain
F
LC
0dB
Phase
0
8
F
LC
-180
8
Frequency
Frequency
-40dB/decade
IRFL3715Z
V
DSS
= 20V
R
DS(ON)
= 11m
IRFR3711Z
V
DSS
= 20V
R
DS(ON)
= 5.7m
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| IRU3138CS | 制造商:IRF 制造商全稱:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3138CSTR | 功能描述:IC REG CTRLR BUCK 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
| IRU3138CSTRPBF | 功能描述:電壓模式 PWM 控制器 SYNC PWM CTRLLER 1A .8V 200 to 400kHz 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(kāi)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 |
| IRU3146 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
| IRU3146CF | 制造商:International Rectifier 功能描述:DC DC CNTRLR DUAL-OUT SYNC BUCK/W/PWM 4.5V TO 16V 28TSSOP - Bulk |
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