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参数资料
| 型号： | NCP102SNT1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 6-TSOP |
| 标准包装： | 3,000 |
| 类型： | 正，可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 电流 - 电源： | 1.8mA |
| 输入电压： | 4.5 V ~ 13.5 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SC-74，SOT-457 |
| 供应商设备封装： | 6-TSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP102SNT1G-ND NCP102SNT1GOSTR |
NCP102
DETAILED OPERATING DESCRIPTION
The NCP102 is a low dropout linear regulator controller
for applications requiring high-current and ultra low
Equation 1 relates the output voltage to the internal
reference voltage and external resistors R1 and R2.
V out + V REF @ R1 ) R2
dropout voltages. The use of an external N-Channel
MOSFET allows the user to adapt the device to a multitude
of applications depending on system requirements for
R2
(eq. 1)
f pole + 6.7016 @ C COMP * 0.846
current and dropout voltage.
An extremely accurate 0.8 V ( ± 2%) reference allows the
implementation of sub 1 V voltage supplies. The reference
is guaranteed over the complete supply and temperature
ranges.
Other features of the NCP102 are a dedicated enable
input, internally compensated error amplifier and an
adjustable soft-start. A minimum drive capability of ± 5 mA
provides fast transient response. The drive current is
internally limited to protect the controller in case of an
external MOSFET failure. The NCP102 is packaged in a
space saving TSOP-6.
SUPPLY VOLTAGE
The NCP102 supply voltage range is between 4.5 V and
13.5 V. The controller is enabled once the supply voltage
exceeds its minimum supply threshold, typically 4.5 V. The
minimum operating voltage is reduced to 4.2 V (typical)
once the controller is enabled to provide noise immunity.
A bypass capacitor is required on the V CC pin to provide
charge storage during power up and transient events. A
minimum of 0.1 m F is recommended.
DRIVE OUTPUT
A powerful error amplifier (EA) capable of driving an
external MOSFET is built into the NCP102. The output of
the error amplifier is connected to the DRV pin. It has a
minimum drive current capability of ± 5 mA providing a fast
transient response.
The EA is biased directly from V CC . The DRV voltage
follows V CC up and it is internally clamped to 9.75 V (typ.).
This allows the use of external MOSFETs with a maximum
gate voltage of 12 V.
The DRV current is provided directly from V CC .
Therefore, the V CC capacitor should be large enough to
maintain a constant V CC during power up and transients.
Otherwise, the supply voltage may collapse reaching the
controller undervoltage lockout threshold.
INTERNAL REFERENCE
The internal 0.8 V reference facilitates the
implementation of sub 1 V supplies required in modern
computing equipment. The internal reference is trimmed
during manufacturing to obtain better than ± 2% accuracy
over the complete operating range.
The output voltage, V out , is programmed using a resistor
divider (R1 and R2) as shown in Figure 1.
The resistor divider senses the output voltage and
compares it to the internal 0.8 V reference.
ERROR AMPLIFIER
The NCP102 has a wide bandwidth error amplifier. It
allows the user to implement a wide bandwidth feedback
loop resulting in better transient response and lower system
cost. It requires the user to compensate the system. A narrow
bandwidth error amplifier usually does not require external
compensation but it requires more output capacitance to
meet typical transient requirements.
The output of the error amplifier is available for frequency
compensation. A capacitor (C COMP ) can be placed between
the DRV and FB pins. In most cases the resistor is not
needed. The uncompensated error amplifier dominant pole
is approximately 1.65 Hz. Any external capacitance
between the DRV and FB pins reduces the dominant pole
frequency due to the Miller multiplication effect. Equation
2 relates the dominant pole frequency to C COMP .
(eq. 2)
EXTERNAL ENABLE
The EN input allows the NCP102 to be remotely enabled.
An internal 10 m A (typ.) current source pulls up the EN
voltage. The EN pin is internally pulled to V CC or 9.5 V,
whichever is lower.
The controller is enabled once the EN pin voltage exceeds
0.8 V (typ.). The controller is disabled by pulling down on
the EN pin. Figure 12 shows the relationship between enable
and soft-start.
EN
SOFT-S
V out
t SOFT-S
Figure 12. Relationship Between Enable and
Soft-Start
The EN pin can be connected to V CC if the enable feature
is not used. If connected to V CC and V CC is higher than 9.5 V
a resistor in series should be used to limit the current into the
EN pin as the pin is internally clamped to 9.5 V. A minimum
of 40 k W is recommended.
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