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參數(shù)資料
| 型號： | SC621EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface |
| 中文描述： | LED燈管理股電荷泵，4個(gè)LED，400mA的閃光LED，雙LDO，和SemWireTM接口 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 320K |
| 代理商： | SC621EVB |
SC621
15
Protection Features
The SC621 provides several protection features to
safeguard the device from catastrophic failures. These
features include:
Output Open Circuit Protection
Over-Temperature Protection
Charge Pump Output Current Limit
LDO Current Limit
LED Float Detection
Output Open Circuit Protection
Over-Voltage Protection (OVP) is provided at the VOUT
pin to prevent the charge pump from producing an
excessively high output voltage. In the event of an open
circuit at VOUT, the charge pump runs in open loop and
the voltage rises up to the OVP limit. OVP operation is
hysteretic, meaning the charge pump will momentarily
turn off until V
OUT
is sufficiently reduced. The maximum
OVP threshold is 6.0V, allowing the use of a ceramic
output capacitor rated at 6.3V with no fear of over-voltage
damage.
Over-Temperature Protection
The Over-Temperature (OT) protection circuit helps
prevent the device from overheating and experiencing
a catastrophic failure. When the junction temperature
exceeds 160 °C, the device goes into thermal shutdown
with all outputs disabled until the junction temperature
is reduced. All register information is retained during
thermal shutdown.
Applications Information (continued)
Charge Pump Output Current Limit
The device also limits the charge pump current at
the VOUT pin. When VOUT is shorted to ground, the
typical output current limit is 300mA. The current limiting
is triggered by an output under-voltage lockout below 2V.
The output returns to normal when the short is removed
and VOUT is above 2.5V. Above 2.5V, a typical current
limit of 300mA applies when the FL current sink is off and
a typical current limit of 1A applies when the FL current
sink is on.
LDO Current Limit
The device limits the output currents of LDO1 and LDO2 to
help prevent it from overheating and to protect the loads.
The minimum limit is 200mA, so load current greater than
the rated 100mA can be used with degraded accuracy
and larger dropout without tripping the current limit.
LED Float Detection
Float detect is a fault detection feature of the LED current
sink outputs. If an output is programmed to be enabled
and an open circuit fault occurs at any current sink output,
that output will be disabled to prevent a sustained output
OVP condition from occurring due to the resulting open
loop. Float detect ensures device protection but does
not ensure optimum performance. Unused LED outputs
must be disabled to prevent an open circuit fault from
occurring.
相關(guān)PDF資料 |
PDF描述 |
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| SC621ULTRT | LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface |
| SC622A | LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface |
| SC622AEVB | LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface |
| SC622AULTRT | LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC621ULTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump,4 LEDs, 400mA Flash LED Dual LDOs,and SemWire Interface |
| SC622 | 制造商:M.E.C. Relays 功能描述: |
| SC622_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and SemWire Interface |
| SC622A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface |
| SC622A_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED,Dual LDOs,and I2C Interface |
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