UNISONIC TECHNOLOGIES CO., LTDTL1451 LINEAR INTEGRATED CIRCUITDUALPULSE-WIDTH-MODULATION CONTROL CIRCUITSDESCRIPTIONThe UTC TL1451 incorporates on a single monolithic chip all the functions required in the construction of two pulse-width-modulation (PWM) control circuits. Designed primarilyfor power supply control, the UTC TL1451 contains an on-chip 2.5V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common –emitter output transistor circuits.FEATURES*Complete PWM power control circuitry*Completely synchronized operation*Internal undervoltage lockout protection*Wide supply voltage range*Internal Short-Circuit protection*Oscillator frequency 500kHz max*Variable dead time provides control over total range*Internal regulator provides a stable 2.5V reference supply*Pb-free plating product number: TL1451LORDERING INFORMATIONOrder NumberNormal Lead free platingPackage Packing TL1451-S16-R TL1451L-S16-R SOP-16TapeReel TL1451-S16-T TL1451L-S16-TSOP-16Tube TL1451-P16-R TL1451L-P16-RTSSOP-16TapeReel TL1451-P16-T TL1451L-P16-TTSSOP-16Tube TL1451-D16-T TL1451L-D16-T DIP-16 TubePIN CONFIGURATIONCT RT1 IN+1 IN-1 FEEDBACK1 DTC 1 OUT GNDVcc2 OUT 2 DTC 2 IN-SCPREF 2 IN+2 FEEDBACK ERROR AMPLIFIER 1ERROR AMPLIFIER 212345678910111213141516BLOCK DIAGRAM1 DTCIN-IN+ERROP AMPLIFIER 1SCP 1 FEEDBACK2 FEEDBACKIN-IN+ERROP AMPLIFIER 22 DTCABSOLUTE MAXIMUM RATINGS (T a =25°C, unless otherwise specified)PARAMETER SYMBOL VALUE UNITSupply Voltage V CC 51 V Amplifier Input Voltage V IN 20 V Collector Output Voltage V OUT 51 V Collector Output Current I OUT 21 mADIP-16 1000 SOP-16 500Power Dissipation TSSOP-16P D 700mW Junction Temperature T J +125 °C Operating Temperature T OPR -20 ~ +85 °C Storage Temperature T STG -40 ~ +150 °CNote 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.Absolute maximum ratings are stress ratings only and functional device operation is not implied.2. The device is guaranteed to meet performance specification within 0 ~+70 operating temperature range and assured by design from –20 ~ +85 .RECOMMENDED OPERATING CONDITIONSPARAMETER SYMBOL MIN TYP MAX UNITSupply Voltage V CC 3.6 50 V Amplifier Input Voltage V IN 1.05 1.45 V Collector Output Voltage V OUT 50 V Collector Output Current(each Transistor) I OUT 20 mA Current into Feedback Terminal I FB 45 µA Feedback Resistor R F 100 k Ω Timing Capacitor C T 150 15000 pF Timing Resistor R T 5.1 100 k Ω Oscillator frequency F OSC 1 500 kHz Operating Temperature T OPR -20 85 °C ELECTRICAL CHARACTERISTICS (V CC =6V, f=200kHz, T a =25°C, unless otherwise specified.)PARAMETER SYMBOL TESTCONDITIONS MIN TYP MAX UNIT Reference Section Output Voltage V OUT I OUT =1mA 2.4 2.5 2.6 VT a = -20°C ~ 25°C -0.1 ±1Output Voltage Change with Temperature T a = 25°C ~ 85°C -0.2 ±1%Input Voltage RegulationV IN Vcc=3.6V ~ 40V 2 12.5mV Output Voltage Regulation V OUT I OUT =0.1mA ~ 1mA 1 7.5 mVShort-Circuit Output Current I OUT V OUT =0 3 10 30 mA Undervoltage Lockout SectionUpper 2.72 VThreshold Voltage (Vcc) Lower V THR2.6 VHysteresis (Vcc) V HYS 80 120 mVReset Threshold voltage (Vcc)I OUT(REF)=0.1mA1.5 1.9 V Short-Circuit Protection Control Section Input Threshold Voltage(SCP) V IN(THR) 0.65 0.7 0.75V Standby Voltage(SCP) V STN-BY No pullup 140 185 230 mV Latched Input Voltage (SCP) V IN(LAT) No pullup 60 120 mV Input (source) Current I IN(source)V IN =0.7V -10 -15 -20 µA Comparator Threshold Voltage (FEEDBACK) V THR 1.18 VELECTRICAL CHARACTERISTICS(Cont.)PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITOscillator Section Frequency F C T =330pF, R T =10k Ω 200 kHz Standard deviation of frequency C T =330pF, R T =10k Ω 10% Frequency Change with Voltage Vcc=3.6V ~ 40V 1%T A =-20°C ~ 25°C -0.4 ±2Frequency Change with TemperatureT A =25°C ~ 85°C-0.2 ±2 % Dead-Time Control Section Input bias Current (DTC) I IN(BIAS) 1 µA Latch mode (source) Current (DTC) -80 -145 µA Latched Input Voltage (DTC) V IN I OUT =40µA 2.3 VZero duty cycle 2.05 2.25Input threshold Voltage at f=10kHz (DTC) V IN(THR) Maximum duty cycle 1.2 1.45VError-Amplifier Section Input Offset Voltage V IN(OFF) V OUT (FEEDBACK)=1.25V ±6 mV Input Offset Current I IN(OFF) V OUT (FEEDBACK)=1.25V ±100nA Input Bias current I IN(BIAS) V OUT (FEEDBACK)=1.25V 160 500 nACommon-Mode Input Voltage Range V IN(CM) Vcc=3.6V ~ 40V1. 05~1.45V Open-loop Voltage Amplification R F =200k Ω 70 80 dB Unity-gain Bandwidth B G 1.5 MHz Common-mode Rejection Ratio RR 60 80 dB Positive Output Voltage Swing V OUT Vref-0.1 V Negative Output Voltage Swing V OUT 1 V Output (sink) Current (FEEDBACK) I OUT(SIN) V ID =-0.1V, V OUT =1.25V 0.5 1.6 mA Output (source) Current (FEEDBACK) I OUT(SOU)V ID =0.1V, V OUT =1.25V -45 -70 µA Output SectionCollector off-state Current I OFF V OUT =50V 10 µA Output Saturation Voltage V OUT(SAT)I OUT =10mA 1.2 2 V Short-Circuit Output Current I OUT(SHT)V OUT =6V 90 mA PWM Comparator SectionZero duty cycle 2.05 2.25Input Threshold Voltage at f=10kHz(FEEDBACK) V I(THR) Maximum duty cycle 1.2 1.45 VTOTAL DEVICEStandby Supply Current I STN-BY Off-state 1.3 1.8 mA Average Supply Current R T =10k Ω 1.7 2.4 mATEST CIRCUITTest InputTIMING DIAGRAM* Protection Enable Time, t pe 106 C pe ) in secondsPower Supply VoltageShort-Circuit ProtectionComparator Output Protection Enable Terminal Waveform Output Transistor CollectorWaveformOscillator Triangle Waveform Error Amplifier Output Dead-Time Input Voltage Short-Circuit Protection Comparator Input VoltagePWM Comparator Output VoltageAPPLICATION INFORMATIONHIGH-SPEED DUAL SWITCHING REGULATOR0.47 NOTE A: Values for R1 through R7, C1 through C4, and L1 and L2 depend upon individual application.TYPICAL CHARACTERISTICS01502005012100Protection Enable Time vs Protection Enable CapacitanceProtection Enable Capacitance, C PE ( F)9182503P r o t e c t i o n E n a b l e T i m e , t p e (s )1561.25VSCP V010k100k1k50100Closed-Loop Gain and Phase Shift vs FrequencyFrequency, f (Hz)30701M10C l o s ed -L o o p G a i n (d B )602040P h a s e S h i f t-90°-80°-70°-60°-50°-40°-30°-20°-10°0°39k 39kTYPICAL CHARACTERISTICS(cont.)010k100k1k50100Closed-Loop Gain and Phase Shift vs FrequencyFrequency, f (Hz)30701M10C l os e d -L o o p G a i n (d B )602040P h a s e S h i f t-90°-80°-70°-60°-50°-40°-30°-20°-10°0°39k 39k010k100k1k50100Closed-Loop Gain and Phase Shift vs FrequencyFrequency, f (Hz)30701M10C l o s ed -L o o p G a i n (d B )602040P h a s e S h i f t-90°-80°-70°-60°-50°-40°-30°-20°-10°0°39k 39kTYPICAL CHARACTERISTICS(Cont.)010k100k1k50100Closed-Loop Gain and Phase Shift vs FrequencyFrequency, f (Hz)30701M10C l o s e d -L o o p G a i n (d B )602040P h a s e S h i f t-90°-80°-70°-60°-50°-40°-30°-20°-10°0°39k 39kTYPICAL CHARACTERISTICS(Cont.)1015580O utput S ink C urrent vsC ollector O utput S aturation V oltageC ollector O utput S aturation V oltage (V )601202020O u t p u t S i n k C u r r e n t (m A )100401030507090110V O (REF ) -0.07-2550750V O (REF ) -0.03Maximum Output Voltage Swing vsFree-Air TemperatureFree-Air Temperature, Ta ( )V O (REF ) -0.04V O (REF ) -0.01100V O (REF ) -0.06M a x i m u m O u t p u t V o l t a ge S w i n g , V O M (V )V O (REF ) -0.02V O (REF ) -0.05250.80.710.50.90.6M a x i m u m O u t p u t V o l t a g e S w i n g , V O M (V )V 100k Vvom - 1V CC = 3.6V R L = 100k V OM+1 = 1.25VV OM-1 = 1.15V (Right Scale)V OM-1 = 1.35V (Left Scale)TYPICAL CHARACTERISTICST r i a n g l e O s c i l l a t o r F r e q u e n c y , t O S C (H z )1k 40k 400k 4k 10k Triangle Oscillator Frequency vs Timing Resistance, R T ( )-255075025Oscillator Frequency Variation vs Free - Air Temperature, Ta ( ) 10k 1k100100k 1MT r i a n g l e W a ve f o r m S w i n g V o l t a g e (V )101010 Triangle Waveform Awing Voltage vs Timing Capacitance Timing Capacitance, C T (pF)T r i a n g l e W a v e f o r m P e r i o d (µs )10101Triangle Waveform Period vs Timing Capacitance 10-11.40.8101051001.2110101010105Timing Capacitance, C T (pF)30-20-25507501025Reference Output Voltage Variation vs Free-Air Temperature Free - Air Temperature, T a ( ) 0-3020100-10R e f e r e n c e O u t p u t V o l t a g eV a r i a t i o n , V O (R E F ) (m V )30-20-25507501025Reference Output Voltage Variation vs Free-Air Temperature Free - Air Temperature, T a ( ) 0-3020100-10R e f e r e n c e O u t p u t V o l t a g e V a r i a t i o n , V O (R E F ) (m V )TYPICAL CHARACTERISTICS(Cont.)0.6-25507500.925Dropout Voltage Variation vs Free-Air Temperature Free - Air Temperature, Ta ( ) 0.811000.7R e f e r e n c e O u t p u t V o l t a g e , V O (R E F ) (V )30.5025305215Reference Output Voltage vs Supply VoltageSupply Voltage, V CC (V)1.502.5401D r o p o u t V o l t a g e V a r i a t i o n (V )3520103.52-2550750325Undervoltage Lockout Characteristics Free - Air Temperature, Ta ( ) 2.53.251002.25O u t p u t C o l l e c t o r V o l t a g e , V C E (V)1034142Undervoltage Lockout HysteresisCharacteristicsSupply Voltage, V CC (V)30552U n d e r v o l t a g e L o c k o u t T h r e s h o l d V o l t a g e (V )2.75U n d e r v o l t a g e L o c k o u t H y s t e r s i s V o l t a g e (m V )3000200100250501501.10-25507501.2525Short-Circuit Protection CharacteristicsFree - Air Temperature, Ta ( )1.201.301001.15C o m p r e t o r T h r e s h o l d V o l t a g e (V )R S -L a t c h R e s e t S u p p l y V o l t a g e (V )12.5231.5 G -G a i n (d B )0Gain (Amplfier In Unity-Gain Configuration) vs Frequency -20-101k 100k 10k 1M 10M-15-55Frequency, f (Hz)TYPICAL CHARACTERISTICS(Cont.)E r r or A m p M a x mu m O u t p u t V o l t a g e S w i n g (V )1k 100k 10k Error Amp Maximum Output Voltage Swing vsFrequencyFrequency, f (Hz)O p e n -L o o p V o l t a g e A m p l i f i c a t i o n (d B )60Open-Loop Voltage Amplification vs Frequency 01.7501M 10M 300.50.2510010k 1k 100k 2M 1M 102040507080Frequency, f (Hz)002030101.5Standby Current vs Supply VoltageSupply Voltage, VCC (V)40S t a n d b y C u r r e n t , I C C (m A )0.750.250.511.251.752100023130Output Transistor on Duty Cycle vsDead-Time Input VoltageDead-Time Input Voltage (V)500480O u t p u t T r a n s i s t o r “O n ” D u t y C y c l e ( )709060402010 1.5 2.50.5 3.50-2525750800Maximum Continuous Power Disspation vs Free-Air Temperature 100M a xi m u m C o n t i n u o u sP o w e r D i s s i p at i o n (m W )400100300500700100011000-2501.5Standby Current vsFree-Air Temperature1000.5S u p p l y C u r r e n t , I C C (m A )0.750.2511.251.752255075Free-Air Temperature, Ta ( )50Free-Air Temperature, Ta ( )2006009001200。