mic9131 Micrel Semiconductor, mic9131 Datasheet
mic9131
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mic9131 Summary of contents
Page 1
... 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 – ...
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... SOP (M) 16-Pin QSOP (QS) Pin Function Line (Input): 180Vdc maximum supply input. May be floated if unused. Supply (Input): MIC9131 internal supply input. Bias Resistor (External Component): Connect 562KΩ to ground. Oscillator RC Network (External Components): Connect external resistor-ca- pacitor network to set oscillator frequency. ...
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... 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 ) ........................ –0.3 to +5.3V FB Sync Input Voltage (V ) ............................ –0.3 to +5.3V SYNC Soft-Start Voltage (V ) .................................. –0.3 to +5.3V SS UVLO Voltage (V ) ................................... –0.3 to +5.3V UVLO Storage Temperature (T ) ........................ – ...
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... 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 V CC LINE (Δ Start-up Current V LINE Supply Supply Current, I Pin 16 (OUT) = OPEN VCC Enable Input Current ...
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... 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 (V) CC Error Amp Reference Voltage vs. Temperature 2.510 V = 10V C C 2.505 R = 560K B IAS 2.500 2.495 2.490 2.485 2.480 -40 - 100120140 TEMPERATURE (° ...
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... 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 7.8 Vcc 7.6 7.4 V =10V 7 =560K B IAS 7 6.8 Vcc 6.6 6.4 -40 - 100120140 TEMPERATURE (°C) Enable Threshold vs ...
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... 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 =560K 44 B IAS V =10V -40 - 100120140 TEMPERATURE (°C) 7 Micrel, Inc. ...
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... 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 Oscillator Frequency vs. RC Values 1000000 47pF 100 p F 100000 220 p F 470 p F 680 p F ...
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... The high voltage startup pin eliminates the requirement for an external start up circuit. This makes it ideal for use with Telecom converters. A block diagram of the MIC9131 is shown in Figure 1. The de- scription of the controller is divided into 6 basic functions: • Power and bias circuitry • ...
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... the total current drawn by the IC VCC I is the sum of the operating current of the MIC9131 at VCC a given frequency and the average current required to drive the external switching MOSFET. A plot of typical operating current vs. frequency is given in Figure 3. The average MOS- FET gate drive current is calculated in the “MOSFET GATE DRIVE” ...
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... Figure 4: UVLO and Soft Start Circuits Enable A low level on the enable pin turns off all the functions of the rises above the MIC9131 and places low quiescent current state. The CC undervoltage lockout output driver low state. When the enable pin is pulled ...
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... The soft start pin and the current sense voltage are connected to a comparator in the MIC9131. The voltage from the soft start pin effectively limits the peak current through the current sense resistor by prematurely terminating the on-time of the gate drive output ...
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... CPWR C1 Figure 7 MOSFET Gate Drive Output The MIC9131 has the capability to directly drive the gate of a MOSFET. The output driver consists of a complimentary P-channel and N-channel pair. The typical switching time August 2006 of the output is dependent on the IC supply voltage and the gate charge required to turn the MOSFET on and off ...
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... Micrel application note AN-24, “Designing with Low Side MOSFET Drivers.” M9999-080206 Current Sense Circuit The current sense input of the MIC9131 has three unique features, which are advantageous in a high speed, high ef- ficiency power supply The overcurrent threshold is nominally 0.82V instead R2 of the typical 1 ...
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... A series resistor between the current sense transformer and the Isns input is not necessary unless it is used for low pass filtering SNS (pin 14 MIC9131 OUT (pin 16) Figure × × ...
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... Without slope compensation, the duty cycle of the power sup- ply will alternate wide and narrow pulses commonly referred to as subharmonic oscillations. Even though the MIC9131 operates below a 50% duty cycle, slope compensation adds the benefits of improved transient response and greater noise immunity in the current sense loop (especially when the current ramp is shallow) ...
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... 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 of the error amplifier, COMP, is connected to the PWM comparator. The error amplifier ...
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... MIC9131 Package Information M9999-080206 16-Pin SOP (M) 16-Pin QSOP (QS) 18 Micrel, Inc. August 2006 ...
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... 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 ...