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型號(hào)：	RCB001
文件頁(yè)數(shù)：	663/1328頁(yè)
文件大?。?/td>	9519K
代理商：	RCB001

PRODUCT SPECIFICATION

connected to OUTEN. Adjusting the oscillator frequency can

add flexibility in the external component selection. See the

Clock Synchronization section.

Output regulation can be monitored with the PWRGD pin

which in turn monitors the internal MIN and MAX compara-

tors. If the output is

5% beyond the selected value for more

s, the PWRGD output will be pulled low. Once the

output has settled within

5% of the selected value for more

than 1ms, PWRGD will return high.

Theory of Operation

Primary Feedback Loop

The regulator output voltage at the SENSE pin is divided

down internally by a resistor divider with a total resistance of

approximately 120k

. This divided down voltage is sub-

tracted from a reference voltage supplied by the DAC output.

The resulting error voltage is amplified by the error amplifier

and the output is compared to the oscillator ramp waveform

by the PWM comparator. This PWM signal controls the

external MOSFETs through G1 and G2. The resulting

chopped waveform is filtered by L

loop. Loop frequency compensation is achieved with an

external RC + C network at the COMP pin, which is con-

nected to the output node of the transconductance amplifier.

MIN, MAX Feedback Loops

Two additional comparators in the feedback loop provide

high speed fault correction in situations where the ERR

amplifier may not respond quickly enough. MIN compares

the feedback signal FB to a voltage 60mV (5%) below the

internal reference. If FB is lower than the threshold of this

comparator, the MIN comparator overrides the ERR ampli-

fier and forces the loop to full duty cycle which is set by the

internal oscillator typically to 82%. Similarly, the MAX

comparator forces the output to 0% duty cycle if FB is more

than 5% above the internal reference. To prevent these two

comparators from triggering due to noise, the MIN and MAX

comparators’ response times are deliberately controlled so

that they take two or three microseconds to respond. These

two comparators help prevent extreme output perturbations

with fast output transients, while allowing the main feedback

loop to be optimally compensated for stability.

Soft Start and Current Limit

The RC5053 includes a soft start circuit which is used for

initial start-up and during current limit operation. The SS pin

requires an external capacitor to SGND with the value deter-

mined by the required soft start time. An internal 10

rent source is included to charge the external SS capacitor.

During start-up, the COMP pin is clamped to a diode drop

above the voltage at the SS pin. This prevents the error

amplifier, ERR, from forcing the loop to maximum duty

cycle. The RC5053 will begin to operate at low duty cycle as

the SS pin rises above about 1.2V (V

1.8V). As SS

continues to rise, Q

turns off and the error amplifier begins

to regulate the output.The MIN comparator is disabled when

soft start is active to prevent it from overriding the soft start

The RC5053 includes yet another feedback loop to control

operation in current limit. Just before every falling edge of

G1, the current comparator, CC, samples and holds the volt-

age drop measured across the external MOSFET, Q1, at the

pin. CC compares the voltage at I

to the voltage at the

pin. As the peak current rises, the measured voltage

across Q1 increases due to the drop across the R

Q1.When the voltage at I

drops below I

, indicating

that Q1’s drain current has exceeded the maximum level, CC

starts to pull current out of the external soft start capacitor,

cutting the duty cycle and controlling the output current

level. The CC comparator pulls current out of the SS pin in

proportion to the voltage difference between I

Under minor overload conditions, the SS pin will fall gradu-

ally, creating a time delay before current limit takes effect.

Very short, mild overloads may not affect the output voltage

at all. More significant overload conditions will allow the SS

pin to reach a steady state, and the output will remain at a

reduced voltage until the overload is removed. Serious over-

loads will generate a large overdrive at CC, allowing it to pull

SS down quickly and preventing damage to the output com-

By using the R

of Q1 to measure the output current,

the current limiting circuit eliminates an expensive discrete

sense resistor that would otherwise be required. This helps

minimize the number of components in the high current path.

Due to switching noise and variation of R

, the actual

current limit trip point is not highly accurate. The current

limiting circuitry is primarily meant to prevent damage to the

power supply circuitry during fault conditions. The exact

current level where the limiting circuit begins to take effect

will vary from unit to unit as the R

of Q1 varies.

For a given current limit level, the external resistor from

can be determined by:

= Maximum load current;

= Inductor ripple current

= RC5053 oscillator frequency = 300kHz

= Inductor value

= Hot on-resistance of Q1 at I

= Internal 180

A sink current at I

-----------------------------------------------------

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
RCB001-12A	制造商:Rochester Electronics LLC 功能描述:- Bulk
RCB002	制造商:未知廠家制造商全稱:未知廠家功能描述:
RCB004	制造商:未知廠家制造商全稱:未知廠家功能描述:
RCB004-12	制造商:Rochester Electronics LLC 功能描述:- Bulk
RCB005	制造商:未知廠家制造商全稱:未知廠家功能描述:

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