参数资料
| 型号： | BD9851EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV HTSSOP-B20 |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 3MHz |
| 电源电压： | 4 V ~ 18 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： | 20-VSSOP（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： | BD9851EFV-E2DKR |
? Setting of oscillation frequency (BD9851EFV)
Connecting a resistor to the RT pin (pin 2) and a capacitor to the CT pin allows
for the setting of oscillation frequency.
1000
C CT =33pF
RT (2)
R RT
CT (3)
C CT
Fig. 19 Setting procedure for BD9851EFV oscillation frequency
1000
1000
C CT =220pF
C CT =1200pF
1000
R RT =4.7kΩ
100
100
R RT =24kΩ
10
1
10
100
10
10
10
100
1000
Timing Resistance (kΩ)
Fig. 20 RT vs. Oscillation frequency
? Setting of timer of short circuit protection circuit (BD9851EFV)
Setting procedure
T SCP = 7.45 × 10 5 × C SCP
T SCP : Time from output short circuit to latch stop [sec]
O SCP : Capacitance of capacitor between the SCP and
GND pins [F]
? Setting of maximum duty (BD9851EFV)
Setting procedure
DUTY(max.) = 100 × (V DTC – Vth0) / (Vth100 – Vth0)
V DTC = 2.5 × R2 / (R1 + R2)
C SCP
Timing Capacitance(pF)
Fig. 20 CT vs. Oscillation frequency
Application
SCP (14)
Application
V REF (17)
DUTY(max.)
V DTC
Vth0
Vth100
:
:
:
:
Maximum duty [%]
DTC pin voltage [V]
0% duty threshold voltage [V]
100% duty threshold voltage [V]
R1
R2
DTC (13)(7)
? Pin treatment of unused channels (BD9851EFV)
(18)
Vcc
(17)
V REF
(18)
Vcc
SEL1
NON2
INV
FB
DTC
PVcc
OUT
(1)
(4)
(16)
(5)
(15)
(6)
(13)
(7)
(12)
(8)
(11)
(9)
Upper : Pin No. to be treated when the CH1 is not used
Lower : Pin No. to be treated when the CH2 is not used
Fig. 22 Pin treatment procedure for unused channel on BD9851EFV
In order to use one channel, treat the pins of unused channel as shown above.
11/165
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