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| 型号： | FSEZ1216NY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM PRIMARY REG MOSFET 8-DIP |
| 产品变化通告： | Product Discontinuation 27/Feb/2012 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 39kHz ~ 45kHz |
| 输入电压： | 5.5 V ~ 25 V |
| 输出电压： | 600V |
| 功率（瓦特）： | 800mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
Cable Voltage Drop Compensation
When it comes to cellular phone charger applications,
the actual battery is located at the end of cable, which
causes, typically, several percent of voltage drop on the
actual battery voltage. FSEZ1216 has a programmable
cable voltage drop compensation, which provides a
constant output voltage at the end of the cable over the
entire load range in CV mode. As load increases, the
voltage drop across the cable is compensated by
increasing the reference voltage of voltage regulation
error amplifier. The amount of compensation is
programmed by the resistor on the COMR pin. The
relationship between the amount of compensation and
Switching Frequen cy
42kHz
the COMR resistor is shown in Figure 26.
15
14
550H z
Dee p
Green
Mode
Green Mode
Normal Mode
13
0.8V
2.8V
V COMV
12
11
10
9
8
7
6
5
4
3
2
1
Figure 27. Switching Frequency in Green Mode
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. FSEZ1216 has an internal frequency
hopping circuit that changes the switching frequency
between 39.4kHz and 44.6kHz with a period of 3ms, as
shown in Figure 28.
Gate Drive Signal
10
20
30
40 50 60
70
80
90
100
R COMR (k )
Figure 26. Cable Voltage Drop Compensation
Temperature Compensation
Built-in temperature compensation provides constant
voltage regulation over wide a range of temperature
variation. This internal compensation current
compensates the forward-voltage drop variation of the
secondary-side rectifier diode.
Green-Mode Operation
The FSEZ1216 uses voltage regulation error amplifier
output (V COMV ) as an indicator of the output load and
modulates the PWM frequency, as shown in Figure 27,
such that the switching frequency decreases as load
decreases. In heavy load conditions, the switching
44.6kHz
42.0kHz
39.4kHz
f s
t
t
t
s
s
s
frequency is fixed at 42KHz. Once V COMV decreases
below 2.8V, the PWM frequency starts to linearly
decrease from 42KHz to 550Hz to reduce the switching
losses. As V COMV decreases below 0.8V, the switching
frequency is fixed at 550Hz and FSEZ1216 enters deep
green mode, where the operating current reduces to
1mA, further reducing the standby power consumption.
3ms
Figure 28. Frequency Hopping
t
? 2009 Fairchild Semiconductor Corporation
FSEZ1216 ? Rev. 1.0.1
11
www.fairchildsemi.com
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