MPS MP1584 Скачать руководство пользователя страница 5

MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER 

 

MP1584 Rev. 1.0 

www.MonolithicPower.com 

5

 

8/8/2011 

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 

 

© 2011 MPS. All Rights Reserved. 

TYPICAL PERFORMANCE CHARACTERISTICS 

V

IN

 = 12V, V

OUT

=5V, C1 = 10µF, C2 = 22µF, L1= 10µH, T

A

 = +25

C, unless otherwise noted. 

V

SW

10V/div.

V

OUT

AC Coupled

10mV/div.

I

L

1A/div.

V

SW

10V/div.

V

OUT

AC Coupled

10mV/div.

I

L

1A/div.

1

v.

Steady State

I

OUT

=0.1A, f

SW

=500kHz 

Steady State

I

OUT

=1A, f

SW

=500kHz 

Steady State

I

OUT

=2A, f

SW

=500kHz 

V

SW

10V/div.

V

OUT

AC Coupled

10mV/div.

I

L

2A/div.

2

v.

2

v.

Oscillating Frequency 

vs. R

freq

OSCILLA

TING FREQUENCY

 (kHZ)

0

200

400

600

800

1000

1200

1400

1600

10

100

1000

10000

 

Содержание MP1584

Страница 1: ...nt inductor current runaway during startup and thermal shutdown provides reliable fault tolerant operation By switching at 1 5MHz the MP1584 is able to prevent EMI Electromagnetic Interference noise p...

Страница 2: ...y Voltage VIN 4 5V to 28V Output Voltage VOUT 0 8V to 25V Operating Junct Temp TJ 20 C to 125 C Thermal Resistance 4 JA JC SOIC8E 50 10 C W Notes 1 Exceeding these ratings may damage the device 2 The...

Страница 3: ...VIN 28V 1 A Current Limit 4 0 4 7 A COMP to Current Sense Transconductance GCS 9 A V Error Amp Voltage Gain 5 200 V V Error Amp Transconductance ICOMP 3 A 40 60 80 A V Error Amp Min Source current VF...

Страница 4: ...ied to this pin 4 FB Feedback This is the input to the error amplifier The output voltage is set by a resistive divider connected between the output and GND which scales down VOUT equal to the interna...

Страница 5: ...VIN 12V VOUT 5V C1 10 F C2 22 F L1 10 H TA 25 C unless otherwise noted VSW 10V div VOUT AC Coupled 10mV div IL 1A div VSW 10V div VOUT AC Coupled 10mV div IL 1A div 1 v Steady State IOUT 0 1A fSW 500k...

Страница 6: ...div Startup IOUT 0 1A 1ms div Shutdown IOUT 0 1A 5ms div Startup IOUT 1A Shutdown IOUT 1A 5ms div Startup IOUT 2A VOUT 2V div IL 1A div VSW 10V div VEN 5V div VOUT 2V div IL 1A div VSW 10V div VEN 5V...

Страница 7: ...tion with current mode control for fast loop response and easy compensation It features a wide input voltage range internal soft start control and precision current limiting Its very low operational q...

Страница 8: ...ect the chip from operating at insufficient supply voltage The UVLO rising threshold is about 3 0V while its falling threshold is a consistent 2 6V Internal Soft Start The soft start is implemented to...

Страница 9: ...till the end of the turn on transition to avoid noise issues The comparator then compares the power switch current with the COMP voltage When the sensed current is higher than the COMP voltage the com...

Страница 10: ...while being driven by the switched input voltage A larger value inductor will result in less ripple current that will result in lower output ripple voltage However the larger value inductor will have...

Страница 11: ...put Rectifier Diode The output rectifier diode supplies the current to the inductor when the high side switch is off To reduce losses due to the diode forward voltage and recovery times use a Schottky...

Страница 12: ...capacitors the ESR dominates the impedance at the switching frequency For simplification the output ripple can be approximated to ESR IN OUT S OUT OUT R V V 1 L f V V The characteristics of the outpu...

Страница 13: ...and good stability at given conditions Table 3 Compensation Values for Typical Output Voltage Capacitor Combinations VOUT V L H C2 F R3 k C3 pF C6 1 8 4 7 47 105 100 None 2 5 4 7 6 8 22 54 9 220 None...

Страница 14: ...inside the high di dt power loop If you have to do so the proper ground plane must be in place to isolate those Switching loss is expected to be increased at high switching frequency To help to improv...

Страница 15: ...2011 MPS All Rights Reserved TYPICAL APPLICATION CIRCUITS C3 100pF C6 NS C4 100nF D1 VOUT 1 8V VIN 4 5V 28V VIN EN FREQ GND BST 5 8 1 4 3 7 2 6 SW FB COMP MP1584 EN Figure 3 1 8V Output Typical Appli...

Страница 16: ...area formed by Input cap high side MOSFET and external switching diode 2 Bypass ceramic capacitors are suggested to be put close to the VIN Pin 3 Ensure all feedback connections are short and direct P...

Страница 17: ...0 013 0 33 0 020 0 51 SEATING PLANE 0 000 0 00 0 006 0 15 0 051 1 30 0 067 1 70 TOP VIEW FRONT VIEW SIDE VIEW BOTTOM VIEW NOTE 1 CONTROL DIMENSION IS IN INCHES DIMENSION IN BRACKET IS IN MILLIMETERS 2...

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