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參數(shù)資料
| 型號(hào)： | FAN5235 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | System Electronics Regulator for Mobile PCs |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | QSOP-24 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 85K |
| 代理商： | FAN5235 |
FAN5235
10
REV. 1.3.3 1/3/02
Error Ampli
fi
er output voltage clamp
During a load transient the error amplifier voltage is allowed
full swing. After two clock cycles, if the amplifier is still out
of range the voltage and consequently the duty cycle (DC) is
clamped. The DC clamp automatically limits the build up of
over-currents during abnormal conditions, including short
circuits:
Figure 6. Duty-Cycle Clamp
Thermal shutdown
If the die temperature of the FAN5235 exceeds safe limits,
the IC shuts itself off. When the over-temperature (OT)
event ends, the IC comes back to normal operation. There is
a 25
°
C thermal hysteresis between shutdown and start up.
Input UVLO
If the input voltage falls below the UVLO threshold, the
FAN5235 turns itself off and stays off as long as Input
voltage is below threshold.
IC Protections Table
* Only the converter in Over-Voltage goes in SOFT CROW-
BAR mode.
EA
+
–
VFB=0.5V+Vo/8
VREF
VRAMP=0.5V+Vin/8
Vclamp=0.5V+
+Vo/8 +/-0.2V
2 Cycles
Counter
0.4V
–
+
–
+
HSD
Buck
LSD
Buck
LDO
LSD
Boost
OC/UV
(Bucks)
OC/UV
(LDO)
OV (Buck)*
OFF-LATCH
OFF-LATCH
ON
OFF-LATCH
"
"
OFF-LATCH
"
OFF
SOFT
CROWBAR
ON
ON
OV (Boost)
SDWN=0
OT
UV (Boost)
OC (Boost)
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF-LATCH OFF-LATCH
ON
OFF-LATCH
ON
ON
ON
33% DC
Generic Mobile System Block Diagram
Figure 7. System Block Diagram
CPU
PGOOD
5V
3.3V
5V-Always
3.3V-Always
SDN5
SDN3.3
FAN5235
RC5231
Vcpu
1.5V
2.5V
μ
P
Clock
CPU
μ
C
8051
μ
C
PGOOD
SDWN
SDWN
Vin=5.6 to 24V
EN
PGOOD
μ
P CODE EXECUTION
RESET
LOGIC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FAN5236MTC | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236MTCX | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236QSC | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236QSCX | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
| FAN5236 | Dual Mobile-Friendly DDR / Dual-output PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5235_CAB3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5235_CAB3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5235MTC | 功能描述:DC/DC 開關(guān)控制器 Regulator System Electronics RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| FAN5235MTC_Q | 功能描述:DC/DC 開關(guān)控制器 Regulator System Electronics RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| FAN5235MTCX | 功能描述:DC/DC 開關(guān)控制器 Regulator System Electronics RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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