TL5001L-S08-T

TL5001 ETL | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD TL5001 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 13 Copyright © 2012 Unisonic Technologies Co., Ltd QW-R103-016,D PULSE-WIDTH-MODULATION CONTROL CIRCUITS „ DESCRIPTION The UTC TL5001 incorporates on a single monolithic chip all the functions required for a pulse width modulation (PWM) control circuit. Designed primarily for power-supply control, It contains an error amplifier, a regulator, an oscillator, a PWM comparator with a dead-time-control input, undervoltage lockout (UVLO), short-circuit protection (SCP) and an open-collector output transistor. The error-amplifier common-mode voltage ranges from 0V to 1.5V. The noninverting input of the error amplifier is connected to a 1-V reference. Dead-time control (DTC) can be set to provide 0% to 100% dead time by connecting an external resistor between DTC and GND. The oscillator frequency is set by terminating RT with an external resistor to GND. During low V CC conditions, the UVLO circuit turns the output off until V CC recovers to its normal operating range. „ FEATURES * Complete PWM power control * 3.6-V to 40-V operation * Internal under voltage-lockout circuit * Internal short-circuit protection * Oscillator frequency : 20kHz to 500kHz * Variable dead timer provides control over total range „ ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free TL5001L-D08-T TL5001G-D08-T DIP-8 Tube TL5001L-S08-R TL5001G-S08-R SOP-8 Tape Reel TL5001L-S08-T TL5001G-S08-T SOP-8 Tube

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 13 www.unisonic.com.tw QW-R103-016,D „ PIN CONFIGURATION

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 13 www.unisonic.com.tw QW-R103-016,D „ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Supply Voltage (Note 1) V CC 41 V Amplifier Input Voltage V I(FB) 20 V Output Voltage V OUT 51 V Output Current I OUT 21 mA Output Peak Current I O(PEAK) 100 mA Continuous Total Power Dissipation See dissipation rating table Operating Ambient Temperature Range T OPR -20 ~ +85 °C Storage Temperature Range T STG -65 ~ +150 °C Note: 1. All voltage values are with respect to the network ground terminal. 2. Absolute maximum ratings are those val ues beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. „ DISSIPATION RATING TABLE PACKAGE TA≤25°C POWER RATING DERATING FACTOR ABOVE TA=25°C TA=70°C POWER RATING TA=70°C POWER RATING TA=70°C POWER RATING DIP-8 1000mW 8.0mW/ °C 640mW 520mW 200mW SOP-8 725mW 5.8mW/ °C 464mW 377mW 145mW „ RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN MAX UNIT Supply Voltage V CC 3.6 40 V Amplifier Input Voltage V I(FB) 0 1.5 V Output Voltage V OUT 50 V Output Current I OUT 20 mA COMP Source Current 45 μA COMP dc Load Resistance 100 kΩ Oscillator Timing resistor R T 15 250 kΩ Oscillator Frequency f OSC 20 500 kHz Operating Ambient Temperature Range T A -20 85 °C

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 13 www.unisonic.com.tw QW-R103-016,D „ ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING FREE-AIR TEMPERATURE RANGE (VCC=6V, fOSC=100kHz, all typical values at TA=25°C, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT REFERENCE Output Voltage V OUT COMP Connected to FB 0.95 1 1.05 V Input Regulation V CC=3.6V ~ 40V 2 12.5 mV Output Voltage Change with Temperature TA= -20°C ~ 25°C -10 -1 10 mV/VTA= 25°C ~ 85°C -10 2 10 UNDERVOLTAGE LOCKOUT Threshold Voltage Upper VTHR TA= 25°C 3 V Lower T A= 25°C 2.8 V Reset T A= 25°C 2.1 2.55 V Hysteresis T A= 25°C 100 200 mV SHORT CIRCUIT PROTECTION SCP Threshold voltage T A= 25°C 0.95 1.00 1.05 V SCP Voltage, Latched No pullup 140 185 230 mV SCP Voltage, UVLO Standby No pullup 60 120 mV Input Source Current T A= 25°C -10 -15 -20 μA SCP Comparator 1 Threshold Voltage 1.5 V OSCILLATOR Frequency f R T=100kΩ 100 kHz Standard Deviation of Frequency 15 kHz Frequency Change with Voltage V CC=3.6V ~ 40V 1 kHz Frequency Change with Temperature TA= 25°C ~ 85°C -4 -0.2 4 kHz Voltage at RT V RT 1 V DEAD-TIME CONTROL Output (source) Current I O(SOURCE) V(DT)=1.5V (Note) 0.9*I RT 1.1*I RT μA Input Threshold Voltage V I(THR) Duty cycle=0% 0.5 0.7 V Duty cycle=100% 1.3 1.5 ERROR AMPLIFIER Input Voltage V IN V CC=3.6V ~ 40V 0 1.5 V Input Bias Current I I(BIAS) -160 -500 nA Output Voltage Swing Positive VO(SW) 1.5 2.3 V Negative 0.3 0.4 V Open-Loop Voltage Amplification G V 80 dB Unity-Gain Bandwidth 1.5 MHz Output (sink) Current I O(SINK) V I(FB)=1.2V, COMP=1V 100 600 μA Output (source) Current I O(SOURCE) VI(FB)=0.8V, COMP=1V -45 -70 μA OUTPUT Output Saturation Voltage V O(SAT) I OUT=10mA 1.5 2 V Off-State Current I OFF VOUT=50V,Vcc=0 10 μA VOUT=50V 10 Short-Circuit Output Current I O(SC) V OUT=6V 40 mA TOTAL DEVICE Standby Supply Current (Off state) I STN-BY 1 1.5 mA Average Supply Current R T=100kΩ 1.4 2.1 mA Note: Output source current at RT

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 13 www.unisonic.com.tw QW-R103-016,D „ SCHEMATIC FOR TYPICAL APPLICATION VIN VOUT VCC SCP DTC RT FB COMP VOUT UTC TL5001 TSP1101 GND „ FUNCTIONAL BLOCK DIAGRAM

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 13 www.unisonic.com.tw QW-R103-016,D „ DETAILED DESCRIPTION VOLTAGE REFERENCE A 2.5-V regulator operating from V CC is used to power the internal circuitry of the TL5001 and as a reference for the error amplifier and SCP circuit. A resistive divider provi des a 1-V reference for the error amplifier non-inverting input which typically is within 2% of nominal over the operating temperature range. ERROR AMPLIFIER The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and generates an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting the error –amplifier gain (see Fig. 1), using the following expression. VOUT = (1+R1/R2) (1V) The error-amplifier output is br ought out as COMP for use in compensating the dc-to-dc converter control loop for stability. Because the amplifier can only source 45µA, the total dc load resistance should be 100kΩ or more. OSCILLATOR/PWM The oscillator frequency (f OSC) can be set between 20kHz and 500kHz by connecting a resistor between RT and GND .Acceptable resistor values range from 15 k Ω to 250 k Ω. The oscillator frequency can be determined by using the graph shown in Fig. 5. The oscillator output is a triangular wave with a mini mum value of approximately 0.7V and a maximum value of approximately 1.3V. The PWM comparator compares the error-amplifier output voltage and the DTC input voltage to the triangular wave and turns the output transistor off whenev er the triangular wave is greater than the lesser of the two inputs.

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 13 www.unisonic.com.tw QW-R103-016,D „ DETAILED DESCRIPTION(Cont.) DEAD TIME CONTORL (DTC) DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for boost and flyback converters. A current source generates a referenc e current (IDT) at DTC that is nominally equal to the current at the oscillator timing terminal, RT. Connecti ng a resistor between DTC and GND generates a dead-time reference voltage (VDT), which the PWM/ DTC comparator compares to the osc illator triangle wave as described in the previous section. Nominally, the maximum duty cycle is 0% when VDT is 0.7V or less and 100% when VDT is 1.3V or greater. Because the triangle wave amplitude is a function of frequency and the source impedance of RT is relatively high(1250 Ω),choosing RDT for a specific maximum duty cycle, D, is accomplished using the following equation and the voltage limits for the frequenc y in question as found in Fig. 11(V OSC(MAX) and V OSC(MIN) are the maximum and minimum oscillator levels): RDT=(RT +1250)[D(VOSC(MAX)-VOSC(MIN))+VOSC(MIN)] Where RDT and RT are in ohms, D in decimal Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Fig. 2. During soft start, the voltage at DTC is derived by the following equation: VDT≈IDTRDT(1-e(-t/RDTCDT)) UTC TL5001RDTCDT DTC6 Fig. 2 Soft- Start Circuit If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, RDTCDT, should be t0/3 to t0/5.The UTC TL5001 remains off unit VDT ≈0.7V, the minimum ramp value. CDT is discharged every time UVLO or SCP becomes active. UNDERVOLTAGE-LOCKOUT (UVLO) PROTECTION The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply voltage drops too low (a pproximately 3V at 25 ℃) for proper operation. A hysteres is voltage of 200mV eliminates false triggering on noise and chattering.

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 13 www.unisonic.com.tw QW-R103-016,D „ DETAILED DESCRIPTION(Cont.) SHORT-CIRCUIT PROTECTION (SCP) The UTC TL5001 includes short-circuit protection (see Fig. 3), which turns the power switch off to prevent damage when the converter output is shorted. When activated, The SCP prevents the switch from being turned on until the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes active or until the SCP terminal is pulled to ground externally. When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle in an attempt to maintain the output voltage. SCP comparator 1 starts an RC timi ng circuit when COMP exceeds 1.5V.If the short is removed and the error-a mplifier output drops below 1.5V before time out, normal converter operation continues. If the fault is still present at the end of the time-out period, the time sets the latching circuit and turns off the UTC TL5001 output transistor. 2.5V RSCP 185kΩ 12kΩCSCP SCP From Error Amp 1.5V scp Comparator 1 VREF=1V scp Comparator 2 To Output Drive Logic Fig. 3 SCP Circuit The timer operates by charging an external capacitor (C SCP),connected between the SCP terminal and ground, towards 2.5V through a 185k Ω resistor (R SCP).The circuit begins charging from an initial voltage of approximately 185mV and times out when capacitor volt age reaches 1V.The output of SCP com parator 2 then goes high, turns on Q2,and latches the timer circuit. The expression for setti ng the SCP time period is derived from the following equation: Where ι=RSCPCSCP The end of the time-out period, tSCP, occurs when VSCP=1V. Solving for CSCP yields: CSCP=12.46*tSCP Where t is in seconds, C in µF tSCP must be much longer (generally 10 to 15 times) than the converter start-up period or the converter will not start. OUTPUT TRANSISTOR The output of the UTC TL5001 is an open-collector transistor with a maximum collector current rating of 21mA and a voltage rating of 51V.The output is turn ed on under the following conditions: the oscillator triangle wave is lower than both the DTC voltage and the error-amp lifier output voltage, t he UVLO circuit is inactive, and the short-circuit protection circuit is inactive.

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 9 of 13 www.unisonic.com.tw QW-R103-016,D „ PARAMETER MEASUREMENT INFORMATION

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 10 of 13 www.unisonic.com.tw QW-R103-016,D „ APPLICATION INFORMATION NOTES: A. Frequency = 200KHz B. Duty cycle = 90% max C. Soft-start time constant (TC) = 5.6ms D. SCP TC = 70msA Fig. 5 Step-Down Converter VCC VOUTSCP COMP DTC RT GND FB UTC TL5001 +C1 100μF 10V GND VIN 470Ω 0.1μF 1μF 0.1μF 56kΩ 43kΩ 0.012μF 5.1kΩ 20μH TPS1101 CR1 MBRS140T3 C2 100μF 10V 7.50kΩ 3.24kΩ 0.0047μF 2.0kΩ GND 3.3V Partial Bill of Materials: Q1 TPS1101 Texas Instruments L1 CTX20-1 or Coiltronics 23 turns of #28 wire on Micrometals No. T50-26B core C1 TPSD 107M010R0100 AVX C2 TPSD 107M010R0100 AVX CR1 MBRS 140T3 Motorola

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 11 of 13 www.unisonic.com.tw QW-R103-016,D „ TYPICAL CHARACTERISTICS -25 25 75-50 0 Ambient Temperature, TA(°C) 100 024 6 81 0.8 Reference Output Voltage vs Power -Supply Voltage Reference Output Voltage, VREF(V) Power-Supply Voltage, VCC (V) 1.2 1.4 0.4 0.2 0.6 1.8 1.6 10k Timing Resistance, RT ( ) Oscillator Frequency vs Timing Resistance Oscillator Frequency, fOSC (Hz) 100k 1M10k 100k VCC=6V DT Resistance=RT TA=25°C 100 Oscillator Frequency, fOSC (Hz) Oscillator Frequency vs Ambient Temperature VCC=6V DT Resistance=100k RT=100k TA=25°C FB and COMP Connected Together -25 25 75-50 0 -0.4 Ambient Temperature, TA (°C) 100 -0.2 -0.6 -0.8 0.2 0.4 Reference Output Voltage Fluctuation, V REF ) Reference Output Voltage Fluctuation vs Ambient Temperature VCC=6V FB and COMP Connected Together 0.6 10 20 300 1.5 0.5 Average Supply Current, ICC(m A) RT=100k TA=25°C Average Supply Current vs Power -Supply Voltage Power-Supply Voltage, VCC (V) -25 25 75-50 0 0.9 Ambient Temperature, TA (°C) 100 1.1 0.8 1.2 1.3 Average Supply Current vs Ambient Temperature VCC=6V DT Resistance=100k RT=100k Average Supply Current, ICC

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 12 of 13 www.unisonic.com.tw QW-R103-016,D „ TYPICAL CHARACTERISTICS(Cont.) 00 . 2 0.4 Output(Sink)Current, IOUT (mA) 0.6 1.5 0.5 0.6 Oscillator Frequency, fOSC (Hz) PWM Triangle Wave Amplitude Voltage vs Oscillator Frequency 100k 1M10k 0.3 2.5 Error Am plifier Output Voltage, V OUT(V) Error Amplifier Output Voltage vs Output(Sink)Current -25 25 75-50 0 2.42 Ambient Temperature, TA(°C) 100 2.43 2.44 2.41 2.40 2.45 2.46 Error Amplifier Output Voltage vs Ambient Temperature -25 25 75-50 0 160 Ambient Temperature, TA(°C) 100 180 200 140 120 220 240 Triancle W ave Am plitude Voltage, PW M (V) 10M 0.9 1.2 1.5 1.8 VOSC(MAX)(100% duty cycle) VOSC(MIN)(zero duty cycle) VCC=6V TA=25°C VCC=6V TA=25°C VI(FB)=1.2V 0 40 Output(Source)Current, IOUT(uA) 120 1.5 0.5 2.5 Error Am plifier Output Voltage, V OUT (V) Error Amplifier Output Voltage vs Output(Source)Current 20 60 100 VCC=6V TA=25°C VI(FB)=0.8V V O-Error Am plifier Output Voltage -V VCC=6V VI(FB)=0.8V No Load VCC=6V VI(FB)=1.2V No Load Error Am plifier Output Voltage, V OUT (V) Error Amplifier Output Voltage vs Ambient Temperature -20 Frequency, f(Hz) Error Amplifier Open-Loop Gain and Phase Shift vs Frequency 100k 1M10k -10 Error Am plifier Open -Loop Gain, G V(dB) 10M VCC=6V TA=25°C GV -180° -210° -240° -270° -300° -330° -360° Error Am plifier Open -Loop Gain, G V (dB)

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 13 of 13 www.unisonic.com.tw QW-R103-016,D „ TYPICAL CHARACTERISTICS(Cont.) 10 1505 Output(Sink)Current, IO(SINK) (mA) 1.5 0.5 Output Saturation Voltage vs Output (Sink) Current 0 -20 -20 -40 RT Output Current, IOUT (μA) -60 -30 -40 -10 -50 -60 DTC Output Current vs RT Output Current -10 -30 -50 TA=25 DT Voltage =1.3V Output Saturation Voltage, V CE (V) 00 . 5 DTC Voltage -V 1.5 100 120 Output Duty Cycle-% Output Duty Cycle vs DTC Voltage VCC=6V TA=25 RT =100Ω 2 20 60 10004 0 Cscp-scp Capacitance -nF 120 tscp-scp Tim e-Out Period -m s Scp-Time-Output Period vs SCP Capacitance VCC=6V TA=25 RT =100Ω DT Resistance =200kΩ DTC Output Current, IO(DT) (μA) VCC=6V TA=25 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.