参数资料
型号: NCP1573DR2
厂商: ON Semiconductor
文件页数: 15/17页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 8-SOIC
产品变化通告: Product Discontinuation 31/Mar/2005
标准包装: 1
PWM 型: 电流/电压模式,V²?
输出数: 1
频率 - 最大: 250kHz
电源电压: 11.4 V ~ 12.6 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 125°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 剪切带 (CT)
其它名称: NCP1573DR2OSCT
NCP1573
Providing fast turn ? on and turn ? off edges to the IC power
is very important in minimizing glitching because there is no
undervoltage lockout circuitry. For example, if the switcher
were powered up and regulating, and the supply began to
decrease slowly, the GATE outputs of the IC would continue
to switch until the driver circuitry ran out of headroom
(when V CC reaches approximately 5 V). When the drivers
collapse, an on ? chip resistor from the GATE pins to ground
will bottom the external n ? channel FETs and the switch
12 V V CC
V OUT
node becomes disconnected from the DC ? DC converter.
Until this happens, it is entirely possible that the bottom FET
may have a large duty cycle and be trying to discharge the
V OUT capacitance. Additionally, as the bias circuitry in the
IC collapses, the reference voltage to the error amplifier may
change and result in false regulation. The circuit in Figure 23
will operate properly with turn ? on and turn ? off times on the
order of 500 μ s or faster.
12 V V CC
V OUT
COMP
COMP
Figure 24. Output Transient with COMP Voltage
Positioned 100 mV Too High
Figure 25. Output Transient with COMP Voltage
Positioned 100 mV Too Low
http://onsemi.com
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