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参数资料
| 型号： | BD9740KN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV SYNC 48UQFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出数： | 7 |
| 输入电压： | 1.5 V ~ 10 V |
| 频率 - 开关： | 100kHz ~ 1.2MHz |
| 电流 - 输出： | 30mA |
| 同步整流器： | 是 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 48-UQFN |
BD9739KN,BD9740KN
Technical Note
6. Setting the oscillating frequency
The oscillating frequency can be set by connecting the resistance value to the RT pin and connecting the capacitance
value to the CT pin.
Oscillating frequency = VRT / (CT ? RT) (Unit: Hz)
*Set the resistance value, connected to the RT pin, from 4.7 k ? to 30 k ?
*Set the capacitance value, connected to the CT pin, from 100 pF to 10,000 pF.
(VRT: RT pin voltage; CT: OSC timing capacitance; RT: OSC timing resistance)
1000
100pF
1000
11k ?
180pF
20k ?
330pF
30k ?
100
100
10
100
100
1000
RT pin RESISTANCE[k ? ]
Fig. 4 Oscillating Frequency Versus RT Pin Resistance
CT pin CAPACITANCE [pF]
Fig. 5 Oscillating Frequency Versus CT Pin Capacitance
7. Startup channel soft-start operation
The startup channel's soft start can be controlled by the capacitor connected to the SS1 pin.
Times can be determined with the following equation:
Startup time (sec) = (VSS / ISS) ? CSS
(VSS = SS pin voltage [= 0.7 V], ISS = soft start charge current [= approximately 2.0 μ A]; CSS = capacitor capacitance)
Example: When CSS = 0.01 μ F, startup time = 0.7 / (2.0 ? 10-6) ? (0.01 ? 10-6) = 3.5 ms
*Set the capacitance value, connected to the SS1 pin, from 0.001 μ F to 2.2 μ F.
STBY1
VCC output voltage waveform
(Startup block repeat
oscillation prohibited)
Approximately 1.0 V
SS1
(Startup block Main)
Approximately
0.5 V
Approximately 0.7 V
VCC
VCC
OSC
VREGA
FB
SS pin voltage
waveform
VREGA
OUT1B
Startup OSC
VREF=1.0 V
Fig. 6 Startup Channel Startup Waveform
(Reference Data)
DRAIN1L
(approximately 100 kHz)
Fig. 7 Timing Chart
8. SWOUT1 pin (BD9734KN/BD9738KN/BD9739KN)
To prevent current from flowing from VOUT1 to the feedback resistor, during standby operation, connect the ground side of
CH1's feedback resistor to SWOUT1.
9. Soft start operation depending on SS pins (BD9739KN)
Soft start operation for CH2 and CH3 can be controlled by the capacitor connected to the SS23 pins.
Times can be determined with the following equation:Startup time (sec) = (VSS / ISS) ? CSS23
(VSS: SS pin voltage [= 1.0 V]; ISS: soft start charge current [= approximately 10 μ A]; CSS: capacitance)
*Startup of CH2 begins when CH3 output reaches approximately 70%.
*Set the capacitance value, connected to each SS23 pin, from 0.005 μ F to 1.0 μ F.
VREGA
VREGA
RA
RB
DTC
R1
R2
Approximately
30 k ?
Approximately
93 k ?
Fig. 8 DTC External Setting Circuit
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
8/14
2010.09 - Rev.A
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