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Part: MIC9131BQS
Category:
Power Management
-> Regulators
-> Switching Regulators
Description: MIC9131 High-Voltage, High-speed Telecom Dc-to-dc Controller
Company: Micrel Semiconductor
Datasheet: Download MIC9131BQS datasheet File size : 141 kB
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MIC9131
Micrel
MIC9131
High-Voltage, High-Speed Telecom DC-to-DC Controller Final Information
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.
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 4 sink, 12 source output driver Programmable under-voltage lockout Constant-frequency PWM current-mode control 16-pin SOIC and 16-pin QSOP Telecom power supplies Line cards ISDN network terminators Micro- and pico-cell base stations Low power (< 100W) dc-dc converters DSL line cards
Applications
Ordering Information
Part Number MIC9131BM MIC9131BQS Max. Duty Cycle 75% 75% Junction Temp. Range 40°C to +125°C 40°C to +125°C Package 16-Pin SOP 16-Pin QSOP
Typical Application
12V
10 10µF 25V
1N5818
4:1
VIN 36V to 72V
1M 0.1µF L = 530µH
6:1 Si4884DY (x2) B320A 37.4k
13 1 2 10
VOUT 3.3V @ 20A
1.5µH 100µF
LINE
7
FB OUT
16
10k
6 3 12 8
UVLO
VCC
EN
Si4884DY (x2)
IRFS3IN20D
COMP MIC9131 RBIAS SS CPWR VBIAS OSC SYNC AGND PGND
4 5 11 15
SLOPE COMPENSATION
ISNS
14
8.2k 0.1 1W
562k 0.1µF
9
10nF
2.61k 270pF
OPTO FEEDBACK
90% Efficient Telecommunications Power Supply
Micrel, Inc. · 1849 Fortune Drive · San Jose, CA 95131 · USA · tel + 1 (408) 944-0800 · fax + 1 (408) 944-0970 · http://www.micrel.com
July 2001
1
MIC9131
MIC9131
Micrel
Pin Configuration
LINE 1 VCC 2 RBIAS 3 OSC 4 SYNC 5 COMP 6 FB 7 CPWR 8 16 OUT 15 PGND 14 ISNS 13 UVLO 12 SS 11 AGND 10 EN 9 VBIAS
16-Pin SOP (M) 16-Pin QSOP (QS)
Pin Description
Pin Number 1 2 3 4 5 6 7 8 Pin Name LINE VCC RBIAS OSC SYNC COMP FB CPWR Pin Function Line (Input): 180Vdc maximum supply input. May be floated if unused. Supply (Input): MIC9131 internal supply input. Bias Resistor (External Component): Connect 562K to ground. Oscillator RC Network (External Components): Connect external resistorcapacitor network to set oscillator frequency. Synchronization (Input): External oscillator input for slave operation of controller. See OSC. Do not float. Compensation (External Components): Error amplifier output for external compensation network connection. Feedback (Input): Error amplifier inverting input. Current Limit Selection (Input): When CPWR is high, an over-current condition at the ISNS input will terminate the gate drive and reset the softstart latch. If the CPWR pin is low, an over-current condition at the ISNS input will terminate the gate drive signal, but will not cause a reset of the soft-start circuit. Reference (Output): Internal 5V supply. Will source 5mA maximum. Enable (Input): Logic level enable/shutdown input; logic high = enabled (on), logic low = shutdown (off). Analog Ground (Return) Soft-Start (External Components): Connect external capacitor to slowly ramp up duty cycle during startup and over-current conditions. Undervoltage Lockout (External Components): Connect to unbiased resistive divider network to set controller's minimum operating voltage. Connect to VBIAS if not needed. Current Sense (Input): Connect between external switching MOSFET source and switch current sense resistor. Power Ground (Return) Switch Drive Output (Output): Connect to gate of external switching MOSFET.
9 10 11 12 13
VBIAS EN AGND SS UVLO
14 15 16
ISNS PGND OUT
MIC9131
2
July 2001
MIC9131
Micrel
Absolute Maximum Ratings (Note 1)
Line Input Voltage (VLINE) ........ +190V VCC Input Voltage (VCC) ............ +19V Current Sense Input Voltage (VISNS) .... 0.3 to +5.3V Enable Voltage (VEN) .... 0.3 to VCC + 0.3V Feedback Input Voltage (VFB) ...... 0.3 to +5.3V Sync Input Voltage (VSYNC) ... 0.3 to +5.3V Soft-Start Voltage (VSS) ......... 0.3 to +5.3V UVLO Voltage (VUVLO) .......... 0.3 to +5.3V Storage Temperature (TS) ..... 65°C to +150°C Power Dissipation (PD) ....... 16-pin SOP .......... 400mW @ TA = +85°C 16-pin QSOP ....... 245mW @ TA = +85°C ESD Rating, Note 3
Operating Ratings (Note 2)
Line Input Voltage (VLINE) ....... VCC to +180V, Note 4 VCC Input Voltage (VCC) ......... +9V to +18V Junction Temperature Range (TJ) .. 40°C to +125°C Package Thermal Resistance 16-pin SOP (JA) ..... 100°C/W 16-pin QSOP (JA) ........... 163°C/W
Electrical Characteristics
TA = 25°C, VLINE = 48V, VCC = 10V, Rt = 9.47K, Ct = 470pF, RBIAS = 562k, VEN = 10V, VISNS = 0V, VUVLO = 2V, VSYNC = 0V, unless otherwise noted. Bold values indicate 40 °C TJ +125°C. Parameter Bias Regulator Output Voltage IVBIAS = 0mA; VOSC = 0V (Oscillator OFF) 9V VCC 18V, IVBIAS = 0mA; VOSC = 0V 0mA IVBIAS 5mA; VOSC = 0V Rt = 9.47K, Ct = 470pF 180 4.7 4.6 Line Regulation Load Regulation Oscillator Section Initial Accuracy (fOSC) Oscillator Output Frequency Maximum Duty Cycle Voltage Stability (f/f) Temperature Stability Maximum Sync Frequency Sync Threshold Level Sync Hysteresis Sync Minimum Pulse Width Error Amp Section FB Voltage Open Loop Voltage Gain, AVOL Unity Gain Bandwidth PSRR COMP Sink Current COMP Source Current VCOMP Low VCOMP High Input Bias Current (IFB) Slew Rate 9V VCC 18V VFB = 2.7V; VCOMP = 5V VFB = 2.3V; VCOMP = 0V VFB = 2.7V; ICOMP = 50µA VFB = 2.3V; ICOMP = +500µA VFB = VCOMP SINK SOURCE 3.5 80 1 VCOMP = VFB 2.475 2.45 2.5 90 4 60 100 2.5 115 4 160 1.5 1.5 300 2.525 2.55 V dB MHz dB µA mA mV V nA V/µs V/µs 9V VCC 18V 40°C TJ 125°C Note 5 200 fOSC/4 75 2.5 100 6 2.5 0.7 50 220 kHz kHz % % ppm/° C MHz V V ns 24 5 4.85 5.0 5.1 40 30 V V mV mV Condition Min Typ Max Units
July 2001
3
MIC9131
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