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| 型号： | IRU3046CFTR |
| 厂商： | International Rectifier |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24TSSOP |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 450kHz |
| 占空比： | 90% |
| 电源电压： | 5 V ~ 12 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 剪切带 (CT) |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | *IRU3046CFTR IRU3046CFCT |
IRU3046
4) Place third pole at the half of the switching frequency.
The transfer function of power stage is expressed by:
sL 2 3 V OSC
Ve(s)
F P3 =
C 12 =
f S
2
1
2 p 3 R 7 3 F P3
I L2 (s) V IN - V OUT
G(s) = = ---(17)
Where:
V IN = Input Voltage
C 12 > 50pF
If not, change R 7 selection.
5) Place R 7 in (16) and calculate C 10 :
V OUT = Output Voltage
L 2 = Output Inductor
V OSC = Oscillator Peak Voltage
As shown the transfer function is a function of inductor
C 10 [
2 p 3 Lo 3 F O 3 Co
R 7
3
V OSC
V IN
current.
The transfer function for the compensation network is
6) Place second pole at ESR zero.
F P2 = F ESR
given by equation (18), when using a series RC circuit
as shown in Figure 8:
( g 3 R R ) 3 ( sC sC R ) ---(18)
1+
2
2
2
R 8 =
1
2 p 3 C10 3 F P2
D(s) =
Ve(s)
R S2 3 I L2 (s)
=
m
S1
S2
Check if R 8 >
1
g m
I L2
If R 8 is too small, increase R 7 and start from step 2.
Fb2
L 2
7) Place second zero around the resonant frequency.
F Z2 = F LC
1
R 6 =
- R 8
2 p 3 C10 3 F Z2
R S2
R S1
Vp2
E/A2
Comp2
R 2
Ve
8) Use equation (1) to calculate R 5 :
L 1
C 2
R 5 =
V REF
V OUT - V REF
3 R 6
I L1
Figure 8 - The PI compensation network
These design rules will give a crossover frequency ap-
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
for slave channel.
The loop gain function is:
H(s)=[G(s) 3 D(s) 3 R S2 ]
( R R ) 3 ( sC C ) 3 ( sL V 3 -V V )
g 3
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45 8 for
overall stability.
H(s)=R S2 3
m
S2 2 2 OSC
S1 1+sR 2 2 IN OUT
The slave error amplifier is a differential-input transcon-
ductance amplifier as well, the main goal for the slave
Select a zero crossover frequency (F O2 ) one-tenth of the
switching frequency:
feed back loop is to control the inductor current to match
the masters inductor current as well provides highest
F O2 =
f S
10
bandwidth and adequate phase margin for overall stabil-
ity.
F O2 = 20KHz
Rev. 1.9
09/27/02
www.irf.com
11
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| IRU3048 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER |
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