参数资料
型号: NCP1234AD65R2G
厂商: ON Semiconductor
文件页数: 28/33页
文件大小: 0K
描述: IC REG CTRLR FLYBACK PWM 7SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 70kHz
占空比: 85%
电源电压: 9.5 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)7 引线
包装: 带卷 (TR)
NCP1234
and the DRV switching starts only if it is allowed; whereas
the Low latch (typically sensing an overtemperature) is
taken into account only after the soft ? start is finished. In
C LATCHmax +
t SSTARTmin @ I NTC(SSTART)min
V clamp0min
(eq. 2)
addition, the NTC current is doubled to I NTC(SSTART) during
the soft ? start period, to speed up the charging of the Latch
pin capacitor. The maximum value of Latch pin capacitor is
+
2.8 @ 10 ? 3 @ 130 @ 10 ? 6
1.0
F + 364 nF
given by the following formula (The standard start ? up
condition is considered and the NTC current is neglected) :
V CC
V CC(on)
V CC(min)
Start-up
initiated by
V CC(on)
Internal Latch Signal
Latch signal
high during
pre-start phase
Noise spike
ignored
(t Latch blanking)
time
time
DRV
Switching
Latch-off
allowed (no
latch event)
time
Figure 47. Latch ? off Function Timing Diagram
Temperature Shutdown
The die includes a temperature shutdown protection with
a trip point guaranteed above 135 ? C and below 165 ? C, and
a typical hysteresis of 30 ? C. When the temperature rises
above the high threshold, the controller stops switching
instantaneously, and the HV current source is turned off.
Internal logic state is reset. When the temperature falls
below the low threshold, the HV start ? up current source is
enabled, and a regular start ? up sequence takes place.
http://onsemi.com
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