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参数资料
| 型号： | BD9300FV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 6/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 14-SSOP |
| 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-LSSOP（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： | BD9300FV-E2DKR |
Description of operations
30k Ω
VCC
100 μ F
500 Ω
33 μ H
Vo
0.1 μ F
100pF
33k Ω
20k Ω
NON
14
1/2
VREF INV
13 12
VREF
11
CTL
10
SCP
9
Vcc
8
500 Ω
100 μ F
90k Ω
0.1 μ F
51k Ω
100pF
1000pF
–
+
ERR
VREF
2.5V
1.25V
TIMER
LATCH
30k Ω
–
– PWM
+
OSC
1
DTC
2
RT
3
4
CT FB
5
OUT
6
N.C.
7
GND
20k Ω
220pF
Fig. 12 Typical application circuit
VREF block
The VREF block is a block to output a reference voltage of 2.5 V (TYP), which is used as the operating power supply for all the
Internal. The CTL pin is used to turn ON/OFF the reference voltage. Furthermore, this reference voltage has a current
capacitance of 1 mA (MIN) or more, from which a high-accuracy reference voltage can be generated through dividing
resistance.
ERRAMP block
The ERRAMP block is an error amplifier to amplify potential between the NON and the INV pins and then output a voltage.
The FB pin output voltage determines the output pulse Duty. When the FB voltage reaches 1.95 V (TYP) or more, switching
will be OFF (Duty=0%). When the FB voltage reaches 1.45 V (TYP) or less, the output NPN Tr will be FULL ON (Duty=100%).
OSC block
The OSC block is a block to determine the switching frequency through the RT and the CT pins. RT and CT voltages determine
the triangular waveform.
TIMER LATCH block
The TIMER LATCH block is an output short circuit protection circuit to detect output short circuit when the output voltage from
the FB pin of the error amplifier reaches 1 V (TYP) or less. When the FB voltage reaches 1 V (TYP) or less, the TIMER will
starts operating to charge the SCP pin at a current capacitance of 7 μ A (TYP). When the SCP voltage reaches 1.8 V (TYP),
the LATCH will be activated to shut down the circuit.
PWM/Driver block
The PWM/Driver block is a PWM comparator to determine Duty value differences between output from the error amplifier
and the oscillator triangular wave. The DTC voltage determines the maximum duty ratio. When the DTC voltage reaches
1.95 V (TYP), the switching OFF is activated. FULL ON will be activated when the DTC voltage reaches 1.45 V (TYP).
The DTC voltage setting should be made through dividing resistance with the VREF block.
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