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参数资料
| 型号： | BD9533EKN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 13/23页 |
| 文件大小： | 0K |
| 描述： | IC REG SW VAR SOFT START 20-HQFN |
| 标准包装： | 1 |
| 系列： | H³Reg™ |
| 应用： | 转换器，DDR SDRAM |
| 输入电压： | 4.5 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 2 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-HQFN |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9533EKN-E2DKR |
6.Setting frequency
3000
On Time (TON) at steady state is determined by
2500
2000
VIN=5V
7V
12V
16V
19V
resistance value connected to FS pin as shown in the
figure. The frequency can be calculated with TON,
input voltage VIN, the reference voltage REF as
follows.
1500
1000
500
F=
REF
V IN × T ON
??? (15)
REF=1.8V
0
0
50
100
150
200
1200
RFS [k ? ]
Calculated frequency
using TON above
However, the actual frequency becomes lower than
the formula due to expanded TON time caused by the
rise/fall time of the MOSFET (This rise/fall time is
affected by the switching speed). TON is also
influenced by Dead Time under light load in
continuous mode. In this case the frequency
becomes lower than setting frequency.
1000
800
VIN=5V
7V
12V
16V
19V
The setting frequency noted above is under heavy
load (when the inductor current does not go back to
VIN through the body diodes of the external
MOSFET’s).
600
400
200
0
0
50
100
150
200
Resistance [k ? ]
7. Setting standard voltage (REF)
V IN
It is available to synchronize setting the reference
H Reg
REF
Outside
3 TM
CONTROLLA
R
S
Q
voltage (REF) with outside supply voltage [V] by using
outside power supply voltage.
voltage
V OUT
VREG
V IN
It is available to set the reference voltage (REF) by the
resistance division value from VREG in case it is not
set REF from an external power supply.
R1
REF
H 3 Reg TM
R
Q
CONTROLLA
S
REF=
R2
×VREG [V] ??? (16)
R2
V OUT
13/20
R1+R2
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