General description

lm2642 The switch frequency is synchronized by two current modes to 300 Qianhe. The two switch regulator controller is in the stage. This characteristic reduces the cubic cubic current current of the input ripples, which significantly reduces the required input capacitance. The output of the two switches can also be connected to the two -phase single output regulator. The output of each channel can independently adjust the maximum duty cycle from 1.3 to the vehicle recognition number. The internal 5V guide can also be used for external driving self -lifting circuits. The current mode feedback control ensures good lines and load adjustment and wide ring circuit bandwidth to fast load transient transient. The current passs through the VDS of the top FET or the field effect of the field effects of the external current fluorine measurement in series with the top leak. The current limit of each channel can be adjusted separately. LM2642 has an analog soft starting circuit that is independent of the output load and output capacitance. This makes the soft -starting behavior more predictable and controllable than the traditional soft -starting circuit. Provide a PGOOD1 pin for monitoring channel 1. Both outputs provide overvoltage protection. Ultraviolet delay stitches can also be used to delay the closing time of IC during the output under pressure event.

Feature

Two synchronous antihypertensive regulator

180 ° Run

4.5V to 30V input range [ 123]

Good Functional Monitor CH.1

37 Wei'an Close current

0.04%(typical) line and load adjustment error

Band or not with no bring The current mode control of the sensor of the sensor

Independent enabled/soft starting pin allows simple order startup configuration.

It can be configured as a single output parallel operation. (See Figure 2).

The weekly current limit can be adjusted

Input under voltage atresia

Output over -voltage atresia

Delay output under voltage protection

[

[ 123] Hot turnover

When the regulator is turned off

tssop package

Embedded computer system

High -end gaming system [ 123]

A set -top box

Webpage

Pipe instructions KS1 (pin 1): Internal ones Positive ( +) the current influenza amplifier of the Kelvin sensing channel 1. Use a separate tracking to connect this pin to the current detection point. It should be as close to the current fluorine resistor as possible. When used without current resistance, as much as possible, approach the MOSFET as much as possible.

Ilim1 (pin 2): Channel 1 electricityStreaming limit threshold settings. It absorbs the constant current of 10 Weian, which is converted to the voltage on the resistance connected to the vehicle recognition number from the pins to the vehicle recognition number. The voltage at both ends of the resistance is compared with any VDS at the top of the MOSFET or the voltage on the resistor on the external current resistance to determine whether the over -current situation has occurred in the channel 1.

comp1 (pin 3): Comeon 1 compensation pin. This is the output of the internal cross -guidance amplifier. The compensation network should be connected to the signal between the pin, SGND (pin 8).

FB1 (pin 4): feedback input of channel 1. Connect to the output voltage of the channel 1 by setting through a separator.

PGOOD1 (pin 5): Fully power output is good channel 1. When the output voltage of the channel 1 is lower than the+15%-9%window. OVP or UVP on PGOD1 on two channels. It will return to the state after the output of the high point " channel 1 (high impedance to the ground) when the output returns within 6%of its nominal value. See the details of the operation instructions.

UV latency (pin 6): The delay time of UVP from the pins to the grounding capacitor group. The capacitor is charging the current source of 5 Wei'an. When the ultraviolet delay is charged to 2.3V (typical value)