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| 型号： | FSDL321 |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN CM OVP HV 8DIP |
| 产品变化通告： | Passivation Layer Change 07/Dec/2007 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 45kHz ~ 55kHz |
| 输入电压： | 8 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 17W |
| 工作温度： | 25°C ~ 140°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 其它名称： | FSDL321_NL FSDL321_NL-ND |
FSDH321, FSDL321
Cfb from 3V to 6V with 5uA.
Vcc
8V
OLP
tection) circuit as shown in figure 7. When the gate turn-on
signal is applied to the power Sense FET, the AOCP block is
enabled and monitors the current through the sensing resis-
tor. The voltage across the resistor is then compared with a
preset AOCP level. If the sensing resistor voltage is greater
than the AOCP level, pulse by pulse AOCP is triggered
regardless of uncontrollable LEB time. Here, pulse by pulse
AOCP stops Sense FET within 350nS after it is activated.
6V
FPS switching
3V
Delay current (5uA) charges the Cfb
Following Vcc
4.4 Over Voltage Protection (OVP) : In case of malfunc-
tion in the secondary side feedback circuit, or feedback loop
open caused by a defect of solder, the current through the
t 1
t 2
t 3
t 4
t
opto-coupler transistor becomes almost zero. Then, Vfb
climbs up in a similar manner to the over load situation, forc-
t 1 = ?
In ( 1 ?
); V ( t 1 ) = 3 V , R = 2 . 8 K ? , C fb = C
t 2 = C fb
; I delay = 5 uA , V ( t 1 + t 2 ) ? V ( t 1 ) = 3 V
1 V ( t 1 )
RC fb R
( V ( t 1 + t 2) ? V ( t 1))
I delay
Figure 6. Over load protection
fb _ fig . 2
ing the preset maximum current to be supplied to the SMPS
until the over load protection is activated. Because excess
energy is provided to the output, the output voltage may
exceed the rated voltage before the over load protection is
activated, resulting in the breakdown of the devices in the
secondary side. In order to prevent this situation, an over
voltage protection (OVP) circuit is employed. In general,
Vcc is proportional to the output voltage and the FPS TM uses
Vcc instead of directly monitoring the output voltage. If
4.2 Thermal Shutdown (TSD) : The Sense FET and the
control IC are integrated, making it easier for the control IC
to detect the temperature of the Sense FET. When the tem-
perature exceeds approximately 140 ° C, thermal shutdown is
V CC exceeds 19V, OVP circuit is activated resulting in ter-
mination of the switching operation. In order to avoid undes-
ired activation of OVP during normal operation, Vcc should
be properly designed to be below 19V.
activated.
5. Soft Start : The FPS TM has an internal soft start circuit
4.3 Abnormal Over Current Protection (AOCP) :
PWM
COMPARATOR
that increases the feedback voltage together with the Sense
FET current slowly after it starts up. The typical soft start
time is 15msec, as shown in figure 8, where progressive
increments of Sense FET current are allowed during the
start-up phase. The pulse width to the power switching
Vfb
Vsense
AOCP
COMPARATOR
LEB
CLK
S
Q
Out Driver
Drain
device is progressively increased to establish the correct
working conditions for transformers, inductors, and capaci-
tors. The voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. It also helps to prevent transformer
V AOCP
R
Rsense
saturation and reduce the stress on the secondary diode.
Drain current
[A]
Figure 7. AOCP Function & Block
Even though the FPS TM has OLP (Over Load Protection)
and current mode PWM feedback, these are not enough to
protect the FPS TM when a secondary side diode short or a
transformer pin short occurs. In addition to start-up, soft-
start is also activated at each restart attempt during auto-
0.7A
0.4A
Tss
restart and when restarting after latch mode is activated. The
FPS TM has an internal AOCP (Abnormal Over Current Pro-
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSDL321L | 功能描述:电源开关 IC - 配电 FPS for DVDP/STB RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSDL321L_Q | 功能描述:电源开关 IC - 配电 FPS for DVDP/STB RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSDLC01G-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
| FSDLC128-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
| FSDLC16G-S | 制造商:AXIOMTEK 制造商全称:AXIOMTEK 功能描述:Capacity: 128MB to 32GB |
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