4 A output current

5.1 V to 40 V output voltage range

0 to 100%of the duty ratio range

Precise (± 2%) film benchmark [ 123]

The switching frequency is as high as 200 kHz

Very efficient (up to 90%)

Few external components

Soft start

reset output

External programming restrictions

current (

l296p )

Presses thicker thyroid control circuit

Remote suppression and

]

Synchronous pulse width adjustment

Hot shutdown

Explanation

L296 and 296P are the voltage power switch voltage regulator output 4 A5.1 volts when voltage changes change. To 40 volts. The characteristics of these devices include the PWM comparator input of SoftBit, remote control HIBIT, thermal protection, microprocessor reset and output, and synchronous timer in synchronous chip configuration in multi -chip configuration. L296 tie -shaped external programmable restrictions on the current. L296 and L296 are installed in a 15 -tile plastic power package with a 15 -drawing wire and require very few external components. The switching frequency is up to 200 kHz allows the external filter component. The voltage induction input and thyristor drive output can be available to choose the outer pry rod overvoltage protection of the silicon.

Circuit operation

(reference square diagram) L296 and L296P are the overall switch voltage voltage voltage voltage 5.1V to 40V, and output 4A. The adjustment loop includes a sawtooth oscillator, an error amplifier, a comparator, and output level generate an error signal with a 5.1von-chip reference voltage (Zina ZAPTRIMMEDTO ± 2%. This error signal is compared with the jagged signal. Width modulation pulse this output phase gain and frequency stability ring circuit can be adjusted to pages 9 through external networks. The closed loop directly gives 5.1V output voltage. High voltage through inserting voltage distributors. When the switch is turned on, the switch is connected Output over -current through the soft startup function. The output of the error amplifier is that when the original capacitor CSS and when the capacitor is charged, the linear rising passes through the constant current source. Instrument. When the load current exceeds the preset threshold, the comparator sets a trigger that the trigger disables the output stage and disconnects the soft startup capacitor. When the voltage on the soft startup capacitor has dropped to 0.4V. And the output voltage increases the network under the soft start control. If the overload is still existed, the threshold current has reached. The average short -circuit current is through the soft startup network. When the power supply voltage exceeds the threshold division of the external settings, Delay time generationEssence When the supply is lower than the threshold resetting output, it becomes lower. The reset output is an open collector. The scrotal circuit induction output voltage and prying rod output can provide 100 mAh current switch to the external SCR. This thyristor is triggered and 20%when the output voltage exceeds the rated value. Input and pry rod sensing input. Pry poles can monitor input or output. The TTL -level inhibitory input to the input of Socchastom/Close Control provided for the application. This input is activated to start a inhibitory device through high -logical level and disabled circuit operation .AF to start the network softly. When the knot temperature reaches about 150 ° C and has a lag to prevent unstable conditions.

Electricity

(Reference test circuit TJ 25O C, vi 35V, unless there are other regulations)

Note (1): Use the minimum 7 A Schottky diode.

(2): The design guarantee, not 100%tested in production.

Electric characteristics (continued)

5.1V/2 on the current limit resistance and pry stick protection on the voltage of the external power supply power supply voltage (L296 Pony) Soft start and repetitive power Electricity When repeated power, the soft startup capacitor CSS must be quickly discharged until every beginning is soft ". This can achieve economical