TL5001L-S08-T

TL5001 UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD TL5001 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 13 Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-016,B 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 Vcc 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 DIP-8 SOP-8 *Pb-free plating product number: TL5001L „ ORDERING INFORMATION Ordering Number Normal Lead Free Plating Package Packing TL5001-D08-T TL5001L-D08-T DIP-8 Tube TL5001-S08-R TL5001L-S08-R SOP-8 Tape Reel TL5001-S08-T TL5001L-S08-T SOP-8 Tube TL5001L-D08-R (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) D08: DIP-8, S08: SOP-8 (3) L: Lead Free Plating , Blank: Pb/Sn

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 13 www.unisonic.com.tw QW-R103-016,B „ PIN CONFIGURATION VOUT VCC COMP FB SCP DTC RT GND

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 13 www.unisonic.com.tw QW-R103-016,B „ ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE (unless otherwise specified)* 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. * Stresses beyond those listed under” absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under” recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. „ DISSIPATION RATING TABLE PACKAGE T A≤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 DŽA COMP dc Load Resistance 100 kȤ Oscillator Timing resistor Rt 15 250 kȤ Oscillator Frequency fosc 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,B „ 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 Vcc=3.6V ~ 40V 2 12.5 mV TA= -20°C ~ 25°C -10 -1 10 Output Voltage Change with Temperature TA= 25°C ~ 85°C -10 2 10 mV/V Undervoltage Lockout Upper T A= 25°C 3 V Lower T A= 25°C 2.8 V Threshold Voltage Reset VTHR TA= 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 Rt=100k Ω 100 kHz Standard Deviation of Frequency 15 kHz Frequency Change with Voltage Vcc=3.6V ~ 40V 1 kHz TA= -20°C ~ 25°C -4 -0.4 4 kHzFrequency 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 0.9*IRT (NOTE) 1.1*IRT (NOTE) µA Duty cycle=0% 0.5 0.7 Input Threshold Voltage V I(THR) Duty cycle=100% 1.3 1.5 V Error Amplifier Input Voltage V IN Vcc=3.6V ~ 40V 0 1.5 V Input Bias Current I I(BIAS) -160 -500 nA Positive 1.5 2.3 V Output Voltage Swing Negative VO(SW) 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 VOUT=50V,Vcc=0 10 Off-State Current I OFF VOUT=50V 10 µA 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 Rt=100k Ω 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,B „ SCHEMATIC FOR TYPICAL APPLICATION VIN VOUT VCC SCP DTC RT FB COMP VOUT UTC TL5001 TSP1101 GND „ FUNCTIONAL BLOCK DIAGRAM UVLO OSC Reference Voltage IDT VCC DTCRT OUT GND PWM/DTC Comparator scp Comparator 2 scp Comparator 1 Error Amplifier SCP FB COMP 1.5V 2.5V

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 13 www.unisonic.com.tw QW-R103-016,B „ DETAILED DESCRIPTION VOLTAGE REFERENCE A 2.5-V regulator operating from Vcc is used to power t he 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 Figure 1), using the following expression. VOUT=(1+R1/R2) (1V) -FB COMP GND VI(FB) VREF=1V To PWM Comparator Compensation Network Figure 1.Error-Amplifier Gain Setting The error-amplifier output is brought out as COMP for use in compensating t he 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 (fosc) can be set between 20k Hz 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 Figure 5. The oscillator output is a triangular wave with a minimum 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.

Figure 2. Soft- Start Circuit every time UVLO or SCP becomes active. false triggering on noise and chattering.

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 13 www.unisonic.com.tw QW-R103-016,B „ DETAILED DESCRIPTION(Cont.) SHORT-CIRCUIT PROTECTION (SCP) The UTC TL5001 includes short-circuit protection (see Figure 3) , which turns the power switch off to prevent damage when the converter output is s horted. When activated, The SCP prev ents 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-am plifier 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 185k0 12k0CSCP SCP From Error Amp 1.5V scp Comparator 1 VREF=1V scp Comparator 2 To Output Drive Logic Figure 3.SCP Circuit The timer operates by charging an external capacitor (Cscp),connected between the SCP terminal and ground, towards 2.5V through a 185k Ω resistor (Rscp).The circuit begins charging from an initial volt age 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) th an the converter start-up peri od 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-ampl ifier output voltage, t he UVLO circuit is inactive, and the short-circuit protection circuit is inactive.

NOTE A:The waveforms show timing characteristics for an intermittent short circuit and a longer short circuit that is sufficient to activate SCP. Figure 4. PWM Timing Diagram

Figure 5. Step-Down Converter

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 11 of 13 www.unisonic.com.tw QW-R103-016,B „ TYPICAL CHARACTERISTICS -25 25 75-50 0 Ambient Temperature , TA(Ę$ 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 (Ω) Oscillator Frequency vs Timing Resistance O scillator Frequency, fosc(Hz) 100k 1M10k 100k Vcc=6V DT Resistance=Rt TA=25Ę$ 100 O scillator Frequency, fosc(Hz) Oscillator Frequency vs Ambient Temperature Vcc=6V DT Resistance=100kΩ Rt=100kΩ TA=25Ę$ FB and COMP Connected Together -25 25 75-50 0 -0.4 Ambient Temperature , TA( Ę$ 100 -0.2 -0.6 -0.8 0.2 0.4 Reference O utput 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=100kΩ TA=25Ę$ Average Supply Current vs Power -Supply Voltage Power-Supply Voltage, Vcc (V) -25 25 75-50 0 0.9 Ambient Temperature , TA (°$ 100 1.1 0.8 1.2 1.3 Average Supply Current vs Ambient Temperature Vcc=6V DT Resistance=100kΩ Rt=100kΩ Average Supply Current, Icc (m

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 12 of 13 www.unisonic.com.tw QW-R103-016,B „ 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(°$ 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(ĘC) 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 Voscmax(100% duty cycle ) Voscmin(zero duty cycle ) Vcc=6V TA=25Ę$ Vcc=6V TA=25ĘC VI( FB)=1.2V 0 40 Output(Source)Current, IoUT(uA) 120 1.5 0.5 2.5 Error Am plifier O utput Voltage, VoUT (V) Error Amplifier Output Voltage vs Output(Source)Current 20 60 100 Vcc=6V TA=25ĘC VI( FB)=0.8V Vo-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, VoUT (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 G ain, Gv(dB) 10M Vcc=6V TA=25Ę$ Gv Φ -180Ę -210Ę -240Ę -270Ę -300Ę -330Ę -360Ę Error Amplifier Open -Loop Gain, Gv (dB)

TL5001 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 13 of 13 www.unisonic.com.tw QW-R103-016,B „ TYPICAL CHARACTERISTICS(Cont.) -25 25 75-50 0 50 Output(Sink)Current, Io(SINK) (mA) 100 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=25Ċ DT Voltage =1.3V O utput 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=25Ċ Rt =100Ω 2 20 60 10004 0 Cscp-scp Capacitance -nF 120 tscp-scp Time-Out Period -m s Scp-Time-Output Period vs SCP Capacitance Vcc=6V TA=25Ċ Rt =100Ω DT Resistance =200kΩ DTC Output Current, Io(DT) (µA) Vcc=6V TA=25Ċ 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.