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参数资料
| 型号： | NCP4331DBR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-TSSOP |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 400kHz |
| 电源电压： | 最高 30V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
NCP4331
D3
X1
D1
L1
V out1
Demag.
Winding
D2
+
C1
LOAD1
Forward
Input
Source
Forward
Controller
GND
X2
V in
X12
Feed-back
with
isolation
NCP4331
L2
V out2
NCP4331
Driven
X13
+
C2
LOAD2
Post-Regulator
Feed-back
Figure 20. NCP4331 Post-Regulator Associated to a Forward Converter
I n the case of a forward operating in continuous
conduction mode (CCM) operation, the cycle is simply
given by the following equation (the converter losses being
neglected):
V in (Post-
Regulator
Input Voltage
d F +
N
N
S
P
V out1
@ V in
forward
(eq. 1)
High-Side
MOSFET Drive
The duty-cycle of the
Where:
d F is the forward duty cycle,
N S /N P is the transformer turn ratio (N P : primary number of
turns, N S : secondary number of turns),
(V in ) forward is the forward converter input voltage,
V out1 is the main output voltage of the forward converter.
http://onsemi.com
12
high-side MOSFET is
modulated by adjusting the
leading edge of its drive
(Leading Edge Modulation)
Figure 21. Leading Edge Modulation
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