参数资料
| 型号： | NCP4331DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 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-SOIC（0.154"，3.90mm 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
13
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| NCP4350DR2G | 功能描述:IC SUPERVISOR DESKTOP PS 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:推挽式，图腾柱 复位:低有效 复位超时:最小 145 ms 电压 - 阀值:2.64V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商设备封装:16-TQFN-EP（4x4） 包装:带卷 (TR) |
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