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参数资料
| 型号： | NCP4331DBR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/22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
V out + d n @ @ V in
N P
As portrayed in Figure 21, the post-regulator controls the
energy to be drawn from the power source V in by adjusting
the time during which the high-side MOSFET is on. This
conduction time is modulated by adjusting the leading edge
of the high side drive while the trailing edge stays
synchronized to the input voltage V in .
As in a traditional buck, the post-regulated output voltage
is given by the following equation:
N S
(eq. 2)
forward
Sequencing and Regulation Block
The following timing diagram portrays the sequencing.
V in (Post-Regulator
Input Voltage)
Internal Reset Signal
Where: d n is the duty cycle of the post-regulator n.
d n < d F since (N S /N P ? (V in ) forward ) is available only during
the forward converter on-time and that anyway, the
high-side MOSFET cannot be turn on as long as V in is low
(i.e., during the forward off-time).
Post-regulated output voltages are then necessarily lower
than the main regulated one. However, the NCP4331
scheme allows d n to nearly equal d f so that if necessary, a
post-regulated output voltage (Vout n ) can be very closed the
main one (V out1 ).
TIME
TIME
250 ns
V ramp (C ramp
Timing Ramp)
TIME
TIME
Sum
(V ramp + EA out )
Low-Side Driver
High-Side Driver
70 ns
70 ns
EA out (Error
Amplifier Out
TIME
TIME
TIME
The Low-Side and
High-Side Trans‐
itions are Delayed
until V in is High.
Figure 22. Timing Diagram
Sequencing and Overlapping
Figure 22 portrays the sequencing of a NCP4331 driven
post-regulator.
The high-side driver turns on (off) after some delay just
after the low-side has switched off (on). More precisely, the
high-side MOSFET:
http://onsemi.com
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