Features

■ Two adjustment output

8V ± 5%, 1A

5V ± 5%, 250 mAh

■ Each one Output independent enabled

■ Independent induction feedback

8V output wires

■ lt; 10μA sleep mode current

■ Failure protection

Overvoltage stop

+45V peak transient state

Voltage

Short circuit

Hot shutdown

■ CMOS compatibility, low current start input input input

Explanation

CS8371

is a 8V/5V dual output linear stabilizer. 8V ± 5%output source 1A, 5V ± 5%output source 250mA. Each output is controlled by its own enable wire. Set the enable input high (enable input input high level) to open the relevant regulator output. Keeping two enable input lows will enable the IC to enter the dormant mode. At this time, the current consumption is less than 10 μA. The regulator can prevent over pressure, short circuit and other out of control. This device can withstand 45V load reserve transients, suitable for use in the car environment. Cherry's patented nocap #8482; solution is the first technology to stabilize output without external capacitors.

CS8371 has a 7 -drawing wire to the 220 copper packaging tab. If it is needed, you can connect the stuck tongue to the radiator.

Figure

Typical performance features

Frequency definition

Falling voltage: The input output voltage is poor. When the input voltage is further reduced, the circuit stops adjusting. When the nominal value of the output voltage drops 100 millivolves when the nominal value is input from 14V, the voltage falls depends on the load current and knot temperature.

current limit: The peak current that can be transmitted to the output end. Input voltage: The input terminal is relative to the DC voltage relative to the ground.

Input Output Sutra: Unprovable input voltage and regulator voltage difference between the adjustment output voltage of the work.

Line adjustment: The output voltage changes when the input voltage changes. The measurement is performed under low power consumption conditions, or the pulse technology is used to make the average chip temperature from significantly affect.

Load adjustment: At the temperature of the constant chip, the output voltage caused by changes in the load current.

Long -term stability: the output voltage stability under the maximum rated voltage and the knot temperature 1000 hours of acceleration life test conditionsEssence

Output noise voltage: The average root of the output side AC voltage with a constant load and no input ripples, measured within the specified frequency range.

Static current: The part of the positive load current does not generate in the positive input current. The regulator ground wire current.

Circuit suppression: The ratio of peak input ripple voltage to peak output ripple voltage.

Vout temperature stability: The heat change from room temperature to extreme temperature changes, the percentage of the output voltage changes.

Application circuit

Application Instructions

CS8371 is a separate control of each output channel. The ideal choice of application. In the car radio, the 8V output drive display and tape drive motor, while 5V output is the regulator IC and memory power supply.

Stability Consider/NOCAP

Generally, low voltage or low voltage differential regulator (or any type that needs to be slow and horizontal PNP in the control loop) needs to have one on the output end of the IC output end. Large external compensation capacitors. External capacitors are also used to suppress overwhelming and determine the launch delay time and load transient response.

The traditional LDO voltage voltage device has a unit gain bandwidth, large display of large displays, tattoos, patterns, and patterns Features such as poor wave suppression capacity. Compensation is also a problem, because high -frequency laid -load electricity values, ESR (equivalent series resistance) and circuit board layout parasites will oscillate It is a special output stage for a cherry semiconductor that compensates the temperature, load and line changes of the LDO regulator inside, and does not require expensive external capacitors. ) At the same time, the many characteristics of the single amplifier (large phase of the margin and non -excellent adjustment).

NOCAP is an ideal choice for slow switching or stable load. If the load shows a large transient current requirement, such as using a high -frequency microprocessor, an output storage capacitor may be required. Some large capacitors and small capacitors ESR values on the output may cause small signal oscillations at the output end. This will depend on load conditions. For these types of loads, traditional output levels may be more suitable for correct operations.

Output 1 uses NOCAP . If the switch characteristics of the load requires external capacitors, please refer to the curve chart in the typical performance characteristics part to obtain a stable output capacitor selection. Output 2 has a Darlington NPN type The output structure is essentially stable in the case of any type of capacitor load or no capacitor.

The power consumption calculation of the dual output linear stabilizer

dual output regulator (pictured 1) The maximum power consumption is:

Among them: VIN (MAX) is the maximum input voltage, the output voltage is minimum value (VOUT1), the output voltage is minimum value (VOUT1), iOUT2 (MAX) is the maximum output current applied. IQ is the regulator when IOUT is IOUT. Consumed static current (MAX).

Once the value of PD (MAX) is known, you can calculate the maximum allowable value of RQJA:

Then The values are compared. The packaging of calculating values in RQ is less than 150 ° C.

In some cases, any encapsulation is not enough to heat dissipate IC, so it needs an external heat sink.

The radiator

The heat sink effectively increases the surface area of the packaging to improve the heat flow from integrated circuits to surrounding air.

Each material in the heat flow between IC and the external environment will have a thermal resistance. Like the series resistance, these resistors are added to determine the value of RQ:

where: RQJC knot-shell thermal resistance, the heat resistance from RQCS shell to the radiator, And the heat resistance of the RQSA radiator to the environment.

RQJC appears in the package part of the data table. Like RQJA, it is also a function of a package type. RQCS and RQSA are functions of encapsulation types, radiator and interfaces between them. These values appear in the data table of the radiator manufacturer.

Packaging specifications

Order information