参数资料
| 型号： | BD9300F-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 14-SOP |
| 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： | 3.6 V ~ 35 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 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： | 14-SOIC（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9300F-E2DKR |
(4) Setting of soft start time
Adding a capacitor to the DTC resistance divider will enable the soft start function activation.
The soft start function will be required to prevent an excessive increase in the coil current and overshoot of the output voltage,
while in startup operation. Fig. 20 shows the relationship between the capacitor and the soft start time. Referring to this Figure,
set the capacitor. It is recommended to set the capacitance value in the range of 0.01 to 10 μ F. Setting the capacitance value to
0.01 μ F or less, may cause overshoot to the output voltage, while setting it to 10 μ F or more may cause an inverse current
in the internal parasitic diode when the power supply is grounded, thus resulting in damage to the internal element.
the internal element.
1.00E+02
Ta=25 ? C
Vcc=12V
Vo=5V
Fosc=220kHz
L=33 μ H
1.00E+01 C OUT =100 μ F
R1=20k
R2=33k
1.00E+00
1.00E–01
1.00E–09
1.00E–08
1.00E–07
1.00E–06
1.00E–05
C DTC [F]
Fig. 20 Soft start capacitance vs. Delay time
Vcc
C5
Q1
R6
Q2
C6
D1
R7
L
D2
C7
OUT
Fig. 21 ON/OFF peak circuit
Since the PNP Tr is generally slow in switching, in terms of the sat characteristics , the ON/OFF peak circuit is used as
an acceleration circuit. The D1 and the C7 generate an ON peak current, while the Q1 and the C7 forms an OFF peak
circuit.Set pull-up resistance to 510 Ω as a guide at VCC=12 V. It is recommended to set this resistance in the range of
100 k Ω to 10 k Ω . In order to make adjustment of the R6 and R7, however, pay attention of the points listed in table below.
NO.
1
2
3
4
Item
Efficiency
Tr Turn ON / Turn OFF
Switching frequency
Load current capacitance
To reduce R6
Degraded
Faster Turn OFF
Increasable
Degraded
To reduce R7
Degraded
Faster Turn OFF
Increasable
Degraded
Take 1000 pF as a guide for the C7 setting. If the ON/OFF peak currents are inadequate, increase the C7 capacitance
value. It is recommended to set capacitance values in the range of 100 pF to 10000 pF. Setting the capacitance value
to 10000 pF or more may increase the peak current and degrade the power efficiency.
9/16
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