参数资料
| 型号： | BD9011KV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 48-VQFP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 550kHz |
| 电源电压： | 3.9 V ~ 30 V |
| 降压： | 是 |
| 升压： | 是 |
| 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 ~ 105°C |
| 封装/外壳： | 48-LQFP |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9011KV-E2DKR |
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(7) Setting over current detection values
The current limit value （ ILimit ） is determined by the resistance of the RCL established between CL and VCCCL.
VCCCL
VIN
I L
Over current detection point
RCL
CL
I L
L
Vo
ILimit =
90m
RCL
[A] ??? (13)
Fig-23
Fig-24
There are 2 current limit function (ON/OFF control type and OFF latch type) toggled by LOFF pin.
? LOFF=L (0<LOFF<1V): Off Latch Type Current Limit
The output becomes OFF and latched when SS=H and, current limit operation, and the output voltage is less than or equal
to 70% of Vo. The OFF latch is deactivated by re-inputting EN signal or VCC control input (switch OFF and ON once more).
? LOFF=H (1<LOFF<VREG5): ON/OFF Control Type Current Limit
When the current goes beyond the threshold value, the current can be limited by reducing the ON Duty Cycle. When the load
goes back to the normal operation, the output voltage also becomes back on to the specific level.
Vo
LOFF=L
（ OFF Latch ）
Fig-25
The current limit value
Vo × 70%
LOFF=H
Io
(8) Method for determining phase compensation
Conditions for application stability
Feedback stability conditions are as follows:
? When gain is 1 (0dB) and phase shift is 150° or less (i.e., phase margin is at least 30°):
a dual-output high-frequency step-down switching regulator is required
Additionally, in DC/DC applications, sampling is based on the switching frequency; therefore, overall GBW may be set at no
more than 1/10 the switching frequency. In summary, target characteristics for application stability are:
? Phase shift of 150° or less (i.e., phase margin of 30° or more) with gain of 1 (0dB)
? GBW (i.e., gain 0dB frequency) no more than 1/10 the switching frequency.
Stability conditions mandate a relatively higher switching frequency, in order to limit GBW enough to increase response.
The key to achieving successful stabilization using phase compensation is to cancel the secondary phase margin/delay
(-180°) generated by LC resonance, by employing a dual phase lead. In short, adding two phase leads stabilizes the
application.
GBW (the frequency at gain 1) is determined by the phase compensation capacitor connected to the error amp. Thus, a larger
capacitor will serve to lower GBW if desired.
①
General use integrator (low-pass filter)
②
Integrator open loop characteristics
A
Phase 0
[deg] -90 0
-20dB/decade
2 π RCA
2 π RC
Feedback
R
FB
A
C
COMP
Gain
[dB] 90
18 0
0
0
-9
(a)
-90 °
GBW(b)
Phase margin -180 °
1
point (a) fa = 1.25[Hz]
point (b) fa = GBW [Hz]
1
-180 0
-18
Fig-26
Fig-27
The error amp is provided with phase compensation similar to that depicted in figures ① and ② above and thus serves
as the system’s low-pass filter.
In DC/DC converter applications, R is established parallel to the feedback resistance.
10/29
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BD9012KV | 制造商:ROHM 制造商全称:Rohm 功能描述:Dual-output, high voltage, high-efficiency step-down switching controller |
| BD9012KV-E2 | 功能描述:开关变换器、稳压器与控制器 Step Down; 2 Outputs RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| BD9013KV-E2 | 功能描述:DC/DC 开关控制器 Step Down; 2 Outputs RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| BD9015KV-ME2 | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 48-VQFPC (7x7) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:2 输出阶段:1 电压 - 电源（Vcc/Vdd）:3.9 V ~ 30 V 频率 - 开关:250kHz ~ 550kHz 占空比（最大）:- 同步整流器:是 时钟同步:是 串行接口:- 控制特性:使能，频率控制，电源良好，软启动 工作温度:-40°C ~ 105°C（TA） 封装/外壳:48-LQFP 供应商器件封装:48-VQFPC（7x7） 标准包装:1 |
| BD9016KV-ME2 | 制造商:ROHM Semiconductor 功能描述: |
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