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HA16107P/FP, HA16108P/FP
8
3. Programming of Maximum ON-Duty (Du Max)
The preceding equations should be used to program the deadband or maximum ON-duty. The
following table gives a summary.
Condition
R
T1
> R
T2
R
T1
= R
T2
R
T1
< R
T2
Triangle
waveform
Du max
Note:
Less than 50%
50%
Greater than 50%*
In a primary-control switching regulator, Du Max > 50% is dangerous because the transformer will
saturate.
Soft Start and Quick Shutdown
One purpose of the soft-start function is to protect the switching controller and power MOSFET from
surges at power-up. Another purpose is to let the secondary-side DC voltage rise smoothly.
When power goes off, the quick-shutdown function rapidly discharges the capacitor in the soft-start circuit
(and at the same time switches the PWM output off) to prepare for the next power-on.
The soft-start function in these ICs lets the PWM output develop smoothly from zero to the designated
pulse width at power-up. The soft-start voltage is the 3.8 V voltage value of an internal Zener diode, so the
PWM output is able to start widening gradually as soon as the soft-start function starts operating. The soft-
start function will start promptly even if C
ST
is large.
The soft-start and quick-shutdown modes are selected automatically in the IC, under control of the UVL
signal.
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| HA16113 | Dual Watchdog Timers |
| HA16113FPJ | Dual Watchdog Timers |
| HA16114FPJ | ID ISC.ANT.MUX 8X ANT MULTIPLEXR |
| HA16114FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| HA16114P | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HA16113 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dual Watchdog Timers |
| HA16113FPJ | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dual Watchdog Timers |
| HA16114 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
| HA16114FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Switching Regulator for Chopper Type DC/DC Converter |
| HA16114FP-E | 制造商:Renesas Electronics 功能描述:1 16SOP 3.9V to 40V 制造商:Renesas Electronics 功能描述:1 16SOP 3.9V to 40V Bulk 制造商:Renesas Electronics Corporation 功能描述:Power Sup,SW Reg.Control IC,S-Down,FP-16 |
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