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参数资料
| 型号： | NCP3521DMR2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP3521DMR2G |
| 设计资源： | NCP3521 Eval Brd BOM NCP3521DMR2GEVB Gerber Files NCP3520/21 Eval Brd Schematic |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 输出电压： | 1.5V |
| 电流 - 输出： | 3A |
| 输入电压： | 4.5 ~ 5.5 V |
| 稳压器类型： | 正，固定式 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP3521 |
| 其它名称： | NCP3521DMR2GEVBOS |
NCP3520/NCP3521
Short Circuit Protection (SCP)
The IC enters normal mode after the NRCS has gone
through powerup. The NRCS capacitor has reached a 1 V
(typ) threshold and fully discharged (50 mV (max)).
When a short circuit event occurs it is detected when the
voltage on V FB goes below (35% of V OUT ). This triggers the
NRCS current source to start charging the NRCS capacitor
at the same 20 m A rate as during powerup. When the voltage
on the capacitor reaches 1.3 V a short circuit event is
confirmed, V G goes low turning off the external FET. V S
Standby Current pulldown is enabled.
Clearing a Short Circuit Latch Condition
A short circuit latch condition can be cleared by toggling
the EN from its high condition to a low condition, and then
back to a high condition.
3V
EN
3V
EN
1.2 V
VS / VFB
1.3 V
1.0 V
NRCS
0V
50 m s
50 m s
1.2 V
VS / VFB
V O * 0.35
Shirt Circuit
is Detected
1.3 V
NRCS
Shirt Circuit Decision Timer
Figure 15. Starting Up Into a Short Circuit (NCP3520
(1.2 V) Version Shown)
Undervoltage Lockout
V CC and V D detection is provided in conjunction with the
EN input pin. When all three conditions are met (V CC is up,
V D is up, and EN is high), the Non Rush Current on Startup
(NRCS) circuitry is allowed to start. Any one of the three
conditions failing will not allow the device to turn on.
The V CC undervoltage threshold is 4.35 V and the V D
threshold is V O * 0.7.
Enable
The Enable function is controlled by the logic pin EN. The
threshold of this pin is set to TTL logic levels. TTL logic
levels are 0.8 V (low) and 2.0 V (high). A low on the EN pin
puts the device is a low current sleep mode consuming less
Output Falls Out
Output Turns Off
than 10 m A (I VCC ). A device going from normal operation
to sleep will 1 st go through a discharge mode maintaining a
of Regulation
Figure 14. Short Circuit (NCP3520 (1.2 V)
Version Shown)
Starting Up Into a Short Circuit
If the NCP3520/NCP3521 turns on and has not gone into
a normal mode of operation, additional time has been added
to the NRCS to ignore potential false short circuit
confirmation during in-rush current events. This time is
independent of the external capacitor value and is typically
50 m s. The voltage on NRCS operates as a normal condition
until it reaches 1 V. The current source charging NRCS turns
off for 50 m s disallowing the voltage to rise on NRCS. After
50 m s the current source turns back on and continues to
charge the NRCS capacitor. Once 1.3 V is reached, the
circuit operates as during a typical short circuit event.
discharge current of 220 mA on V S (measured @ V S = 1 V).
This pin has 60 mV (typ) of hysteresis to guarantee a clean
switching threshold.
External Components
A capacitor between V O and ground is required for
stability. A 220 m F value capacitor such as the
SANYO 2R5TPE220MF is recommended. The
SANYO 2R5TPE220MF capacitor has a 15 m W maximum
specification. Contact resistance and board trace resistance
are the significant contributors to output capacitor ESR
below 10 m W .
As ON Semiconductor's NCP352X family of LDO
controllers may be considered as an alternative to
Rohm's family of LDO controllers, alternative FETs such as
industry compatible parts like the Si4866DY may also be
used in conjunction with ON Semiconductor's controller.
http://onsemi.com
8
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| NCP360MUTXG | 功能描述:监控电路 USB POS OVP PMOSFET AND STATUS FLAG RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| NCP360SNAET1G | 功能描述:监控电路 USB OVP SUPERVISORY RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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