参数资料
| 型号： | BD9305AFVM-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 8-MSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 800kHz |
| 占空比： | 100% |
| 电源电压： | 4.2 V ~ 18 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： | -40°C ~ 85°C |
| 封装/外壳： | 8-VSSOP，8-MSOP（0.110"，2.80mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | BD9305AFVM-DKR BD9305AFVM-DKR-ND BD9305AFVMDKR |
BD9306AFVM, BD9305AFVM
Technical Note
(9) Phase compensation
Phase Setting Method
The following conditions are required in order to ensure the stability of the negative feedback circuit.
? Phase lag should be 150° or lower during gain 1 (0 dB) (phase margin of 30° or higher).
Because DC/DC converter applications are sampled using the switching frequency, the overall GBW should be set to 1/10
the switching frequency or lower. The target application characteristics can be summarized as follows:
? Phase lag should be 150° or lower during gain 1 (0 dB) (phase margin of 30° or higher).
? The GBW at that time (i.e., the frequency of a 0-dB gain) is 1/10 of the switching frequency or below.
In other words, because the response is determined by the GBW limitation, it is necessary to use higher switching
frequencies to raise response.
One way to maintain stability through phase compensation involves canceling the secondary phase lag (-180°) caused by
LC resonance with a secondary phase advance (by inserting 2 phase advances).
The GBW (i.e., the frequency with the gain set to 1) is determined by the phase compensation capacitance connected to
the error amp. Increase the capacitance if a GBW reduction is required.
(a) Standard integrator (low-pass filter)
(b) Open loop characteristics of integrator
Gain
A
(a)
-20 dB/decade
Feedback R
＋
A
COMP
[dB]
0
GBW(b)
－
F
FB
C
0
Phase
-90
[°]
-90°
Phase margin
-180°
-180
F
Fig. 28
Fig. 29
Point (a)
fa =
1
2 π RCA
[Hz]
Point (b)
fb = GBW =
1
2 π RC
[Hz]
The error amp performs phase compensation of types (a) and (b), making it act as a low-pass filter.
For DC/DC converter applications, R refers to feedback resistors connected in parallel.
From the LC resonance of output, the number of phase advances to be inserted is two.
Vo
LC resonant frequency fp =
1
2 π √ LC
[Hz]
R1
R4
C1
Phase advance
fz1 =
1
2 π C1R1
[Hz]
R2
－
＋
A
COMP
R3
Phase advance
fz2 =
1
2 π C2R3
[Hz]
C2
Fig. 30
Set a phase advancing frequency close to the LC resonant frequency for the purpose of canceling the LC resonance.
( ※ )If high-frequency noise is generated in the output, FB is affected through condenser C1.
Therefore, please insert the resistor R4=1k Ω or so, which is in series with condenser C1.
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
10/14
2009.05 - Rev.A
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