MIC9131BM Micrel Inc, MIC9131BM Datasheet

MIC9131BM

Manufacturer Part Number

MIC9131BM

Description

IC CTRLR DC-DC PWM HV HS 16-SOIC

Manufacturer

Micrel Inc

Datasheet

1.MIC9131YM.pdf (19 pages)

Specifications of MIC9131BM

Applications

Controller, Telecom

Voltage - Input

9 ~ 18 V

Number Of Outputs

Voltage - Output

4.7 ~ 5 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

16-SOIC (3.9mm Width)

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MIC9131BM

Manufacturer:

ICS

Quantity:

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General Description

The MIC9131 is a current-mode PWM controller that efﬁciently

converts –48V telecom voltages to logic levels. The MIC9131

features a high voltage start-up circuit that allows the device to

be connected to input voltages as high as 180V. The high input

voltage capability protects the MIC9131 from line transients

that are common in telecom systems. The start-up circuitry

also saves valuable board space and simpliﬁes designs by

integrating several external components.

The MIC9131 is capable of high speed operation. Typically

the MIC9131 can control a sub-25ns pulse width on the gate

out pin. Its internal oscillator can operate over 2.5MHz, with

even higher frequencies available through synchronisation.

The high speed operation of the MIC9131 is made safe by

the very fast, 34ns response from current sense to output,

minimizing power dissipation in a fault condition.

The MIC9131 allows for the designs of high efﬁciency power

supplies. It can achieve efﬁciencies over 90% at high output

currents. Its low 1.3mA quiescent current allows high efﬁciency

even at light loads.

The MIC9131 has a maximum duty cycle of 75%. For designs

requiring a maximum duty cycle of 50%, refer to the MIC9130.

The MIC9131 is available in a 16-pin SOP and 16-pin QSOP

package options. The junction temperature range is from

–40°C to +125°C.

Typical Application

August 2006

MIC9131

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

36V to 72V

VIN

562kΩ

10kΩ

10nF

0.1µF

90% Efﬁcient Telecommunications Power Supply

37.4kΩ

1MΩ

2.61kΩ

270pF

COMP

RBIAS

CPWR

VBIAS

OSC

SYNC

0.1µF

MIC9131

AGND PGND

12V

ISNS

OUT

COMPENSATION

SLOPE

8.2kΩ

L = 530µH

6:1

0.1Ω

IRFS3IN20D

Features

• Input voltages up to 180V

• Internal oscillator capable of > 2.5MHz operation

• Accurate 75% maximum duty cycle

• Synchronisation capability to 6MHz

• Current sense delay of 34ns

• Minimum pulse width of <25ns

• 90% efﬁciency

• 1.3mA quiescent current

• 1µA shutdown current

• Soft-start

• Resistor programmable current sense threshold

• Selectable soft-start retry

• 4Ω sink, 12Ω source output driver

• Programmable under-voltage lockout

• Constant-frequency PWM current-mode control

• 16-pin SOIC and 16-pin QSOP

Applications

• Telecom power supplies

• Line cards

• ISDN network terminators

• Micro- and pico-cell base stations

• Low power (< 100W) dc-dc converters

• DSL line cards

FEEDBACK

OPTO

Si4884DY

(x2)

Si4884DY

(x2)

High-Voltage, High-Speed Telecom

B320A

10Ω

10µF

25V

DC-to-DC Controller

1N5818

1.5µH

100µF

4:1

MIC9131

3.3V @ 20A

VOUT

M9999-080206

Micrel, Inc.

Related parts for MIC9131BM

MIC9131BM Summary of contents

Page 1

MIC9131 General Description The MIC9131 is a current-mode PWM controller that efﬁciently converts –48V telecom voltages to logic levels. The MIC9131 features a high voltage start-up circuit that allows the device to be connected to input voltages as high as ...

Page 2

... MIC9131 Ordering Information Part Number Standard Pb-Free MIC9131BM MIC9131YM MIC9131BQS MIC9131YQS Pin Conﬁguration Pin Description Pin Number Pin Name 1 LINE 2 VCC 3 RBIAS 4 OSC 5 SYNC 6 COMP CPWR 9 VBIAS AGND UVLO 14 ISNS 15 PGND 16 OUT M9999-080206 Max. Duty Cycle Junction Temp. Range 75% -40° ...

Page 3

MIC9131 Absolute Maximum Ratings Line Input Voltage (V ) ......................................... +190V LINE V Input Voltage (V ) .............................................. +19V CC CC Current Sense Input Voltage (V ISNS Enable Voltage (V ) ............................ –0 Feedback Input Voltage (V ...

Page 4

MIC9131 Parameter Condition Preregulator Input Leakage Current V LINE V Gate Lockout ( GLO(ON) LINE V Gate Lockout Hysteresis V CC LINE (ΔV ) GLO V Pre-Regulator Off ( PR(OFF) LINE V Pre-Regulator Hysteresis ...

Page 5

MIC9131 Typical Characteristics Oscillator Frequency vs. V Voltage CC 0.3 0.2 0.1 0.0 -0 -0.2 F =200kHz -0.3 OSC (NOM =9.47K -0 =470pF -0 ...

Page 6

MIC9131 V vs. V BIAS CC 5.012 R = 560K B IAS 5.010 5.008 5.006 5.004 5.002 5.000 4.998 ( Turn On/Off Thresholds CC vs. Temperature ...

Page 7

MIC9131 ISNS Pin Source Current vs =560K B IAS 41.5 41 40.5 40 39 (V) CC August 2006 ISNS Pin Source Current vs. Temperature 45 R ...

Page 8

MIC9131 Functional Block Diagram FB COMP OSC 7 6 Error 1.2V Amplifier 40µA ISNS 14 VBIAS 9 0.82V 5V EN BIAS 10 REG RBIAS 3 1.21V 5V 4µ CPWR 8 Q VCC 2 LINE 1 Thermal Shutdown M9999-080206 ...

Page 9

MIC9131 Functional Description Micrel’s MIC9131 is a high voltage, high speed current mode switching power supply controller. It uses a BiC/DMOS pro- cess to achieve a high voltage input, low quiescent current and very fast internal delay times. The MIC9131 ...

Page 10

MIC9131 plied and the depletion FET, which is normally enabled allows current from V to charge the V bias capacitor. Once the voltage reaches the V enable threshold the gate drive is enabled and ...

Page 11

MIC9131 GND UVLO Undervoltage Lockout CC The V voltage is internally divided down and compared 1.21V internal bandgap reference turn-on threshold, it disables the ...

Page 12

MIC9131 P_OSCILLATOR CHARGE DISCHARGE Where t = 75ns DELAY OSCILLATOR OSCILLATOR × OUTPU S OSCILLATOR 4 The timing capacitor, C ...

Page 13

MIC9131 cycle of the gate drive output increases until the error ampli- ﬁer takes control of the duty cycle. The soft start capacitor is discharged by an internal MOSFET in the MIC9131. The soft start circuit is activated by the ...

Page 14

MIC9131 Gate Drive Output GND 1:N Figure 10 The gate impedance of a MOSFET is capacitive and the power required to drive the gate is proportional to the charge required to turn on the MOSFET, the peak ...

Page 15

MIC9131 series resistance is 10K, for a 500kHz switcher, the maximum series resistance is 2K. Sensing Current with a Resistor The fast transition times of the current signal prohibit the use of inductive resistors. Standard wire wound power resistors will ...

Page 16

MIC9131 If the current sense transformer were not used, the sense resistor would dissipate 1.7 watts SENSE 164 SENSE I 5 SENSE × ...

Page 17

MIC9131 Error Ampliﬁer The error ampliﬁer is part of the voltage control loop of the power supply. The FB pin is the inverting input to the error ampliﬁer. The non-inverting input is internally connected to a 2.5V reference. The output ...

Page 18

MIC9131 Package Information M9999-080206 16-Pin SOP (M) 16-Pin QSOP (QS) 18 Micrel, Inc. August 2006 ...

Page 19

... MIC9131 MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel reserves the right to change circuitry and speciﬁcations at any time without notiﬁcation to the customer. Micrel Products are not reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signiﬁ ...

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