CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR GENERAL DESCRIPTION FEATURES This of PWM modulator provides a complete pulse width ! Dual uncommitted 40V, 200mA output transistors. modulation system in a single monolithic integrated circuit. ! 1% accurate 5V reference. This device includes a 5V reference accurate to ±1%, two ! Dual error amplifiers. independent amplifiers usable for both voltage and current ! Wide range, variable dead time. sensing, an externally synchronizable oscillator with its ! Single-ended or push-pull operation. linear ramp generator, and two-uncommitted transistor ! Under-voltage lockout with hysteresis. output switches. These two outputs may be operated ! Double pulse protection. either in parallel for single-ended operation or alternating ! Master or slave oscillator operation. for push-pull applications with an externally controlled dead-band. This unit is internally protected against double-pulsing of a single output or from extraneous output signals when the input supply voltage is below minimum. The CM494 contains an on-chip 39V zener diode for high-voltage applications where Vcc would be greater than 40V, and a buffered output steering control that overrides the internal control of the pulse steering flip-flop. APPLICATIONS ! Linear Regulators ! Adjustable Supplies ! Switching Power Supplies ! Battery Operated Computers ! Instrumentation ! Computer Disk Drives 2000/12/29 Preliminary PIN CONFIGURATION 16-PIN PDIP/SOP (Top View) 1 1IN+ 2IN+ 16 2 1IN- 2IN- 15 3 FEEDBACK REF 14 4 DTC OUTPUT CTRL 13 5 CT VCC 12 6 RT C2 11 7 GND E2 10 8 C1 E1 9 Champion Microelectronic Corporation Page 1 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR BLOCK DIAGRAM OUTPUT CTRL RT 6 Oscillator FUNCTION TABLE 13 Output Control CT 5 Dead-Time Control Comparator ID Output Function Connected to : Q1 8 Single-Ended or C1 4 0.1v + _ 9 C1 DTC E1 + _ Error Amplifier 1 1 1IN+ 2 Q2 PWM Comparator Output 15 12 UM495A 14 Reference Regulator Output Function Steering Control （Output Control at VCC + _ 2IN- Push-Pull Alternating C2 E2 Error Amplifier 2 16 VREF 11 Pulse-Steering Flip-Flop 2IN+ Parallel Operation 10 + _ 1IN- Ground REF VREF） Vs < 0.4V PWM Output at Q1 Vs > 2.4V PWM Output at Q2 7 3 GND FEEDBACK ORDERING INFORMATION Temperature Range Package CM494CP Part Number 0℃ to 70℃ 16-PIN DPIP (P16) CM494CS 0℃ to 70℃ 16-PIN SOP (S16) 2000/12/29 Preliminary Champion Microelectronic Corporation Page 2 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR ABSOULTE MAXIMUM RATINGS Supply voltage, Vcc(Note 2)………………………… 45V Amplifier input voltages…………………… Vcc + 0.3V Collector output voltage…………………………… 41V Collector output current………………………… 250mA Continuous total dissipation…………………… 1000mW @ (or below) 25℃ free air temperature range (Note 3) Storage temperature range………………-65℃ to + 150℃ Lead temperature 1 / 16"(1.6mm) from case for 60 seconds, J package…………………………………………300℃ Lead temperature 1 / 16"(1.6mm) from case for 10 seconds, N package……………………………………… 260℃ Note 1: Over operating free air temperature range unless otherwise noted. Note 2: All voltage values are with respect to network ground terminal 3. Note 3: Consult package section of data book regarding thermal specification and limitation of package. RECOMMENDED OPERATING CONDITION Supply voltage Vcc…………………… 7V to 40V Error amplifier input voltages………-0.3 to Vcc-2V Collector output voltage……………………… .40V Collector output current (each transistor)… 200mA Current into feedback terminal………………..0.3mA Timing capacitor, CT… 0.47nF to 10,000nF Timing resistor, RT………………..1.8kΩ to 500kΩ Oscillator Frequency…………………1kHz to 300kHz Operating free air temperature UC494A, UC495A………………-55℃ to + 125℃ UC494AC, UC495AC……………….0℃ to +70℃ 2000/12/29 Preliminary Champion Microelectronic Corporation Page 3 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR ELECTRICAL CHARACTERISTICS: Unless otherwise stated, over recommended operating free-air temperature range. Vcc = 15V, f = 10Khz, TA=TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 4.75 5 5.25 V Reference Section Output voltage VREF lo = 1mA, TA= 25℃ Input regulation Vcc = 7V to 40V 2 25 mV Output regulation lo = 1mA to 10mA 1 15 mV Output voltage over temperature ΔTA= Min. to Max 4.90 5.10 V Short circuit output current VREF = 0, TA= 25℃ 10 50 mA 35 Oscillator Section Frequency (Note 2) CT = 0.01µF, RT = 12Ω 10 kHz Standard deviation of frequency (Note 3) All values of Vcc, CT, RT, TA 10 % Frequency change with voltage Vcc = 7V to 40V, TA= 25℃ 0.1 % Frequency change with temperature CT = 0.01µF, RT = 12kΩ, ΔTA= Min. to Max 2 % -10 µA Deadtime Control Section (Output control connected to VREF ) Input bias current (Pin 4) V (PIN 4) = 0V to 5.25V Maximum duty-cycle (each output) V (PIN 4) = 0V -2 45 % Deadtime control Section (cont.) （Output control connected to VREF） Input threshold voltage (Pin 4) Zero duty-cycle 3 Maximum duty-cycle 3.3 0 V V Amplifier Section Input offset voltage Vo (PIN 3) = 2.5V 2 10 mV Input offset current Vo (PIN 3) = 2.5V 25 250 nA Input bias current Vo (PIN 3) = 2.5V -0.2 -1 µA Common-mode input voltage range Vcc = 7V to 40V .03 to V Vcc -2 Open loop voltage gain ΔVo = 3V, Vo = 0.5V to 3.5V 70 Unity gain bandwidth Common-mode rejection ratio 95 dB 800 kHz Vcc = 40V, TA = 25℃ 65 80 dB Output sink current (Pin 3) VID = -15mV to –5V, V (Pin 3) = 3.5V 0.3 0.7 mA Output Source current (Pin 3) VID = -15mV to 5V, V (Pin 3) = 3.5V -2 2000/12/29 Preliminary Champion Microelectronic Corporation mA Page 4 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR ELECTRICAL CHARACTERISTICS: Unless otherwise stated, over recommended operating free-air temperature range. Vcc = 15V, f = 10Khz, TA=TJ PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Output Section Collector off-state current VCE = 40V, Vcc = 40V Emitter off-state current Vcc = Vc = 40V, VE = 0 Collector-Emitter Common-Emitter VE = 0, lc = 200mA Saturation voltage Emitter-follower Vc =15 V, lE = -200mA Output control input current 2 100 µA -100 µA 1.1 1.3 V 1.5 2.5 V 3.5 mA 4.5 V Vl = VREF PWM Comparator Section Input threshold voltage (Pin 3) Zero duty-cycle Input sink current (Pin 3) V (Pin 3) = 0.7V 4 0.3 0.7 mA Steering Control Input current V (Pin 13) = 0.4V,Q1 ACTIVE -200 µA V (Pin 13) = 2.4V,Q2 ACTIVE 300 µA Deadband 500 mA Zener Diode Circuit（UC495A） Breakdown voltage Vcc = 45V, lz = 2mA 36 39 .45 V Sink current V (Pin 15) = 1V 0.2 0.3 0.6 mA Total Device Standby supply current Pin 6 at VREF, All other inputs Vcc = 15V 6 10 mA and outputs open Vcc = 40V 9 15 mA 6.5 V Under voltage lockout 3.5 Hysteresis 300 mV Switching Characteristics（TA = 25℃） Output voltage rise time Common-emitter configuration 100 200 ns Output voltage fall time RL = 68Ω, CL= 15pF 25 100 ns Output voltage rise time Emitter-follower configuration 100 200 ns Output voltage fall time RL= 68Ω, CL= 15pF 40 100 ns Note 1: Duration of the short circuit should not exceed one second. Note 2: Frequency for other values of CT and RT is approximately f = 1.1/RTCT Note 3: Standard deviation is measure of the statistical distribution about the mean as derived from the formula: n 2 Σ(Xn -X) n=1 σ= n-1 2000/12/29 Preliminary Champion Microelectronic Corporation Page 5 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR TYPICAL CHARACTERISTICS 2000/12/29 Preliminary Champion Microelectronic Corporation Page 6 CM494 ADVANCED REGULATING PULSE WIDTH MODULATOR PACKAGE DIMENSION 16-PIN PDIP (P16) PIN 1 ID θ θ 16-PIN SOP (S16) PIN 1 ID θ θ 2000/12/29 Preliminary Champion Microelectronic Corporation Page 7 CERAMIC/SURGE ABSORBER SHANGHAI,CHINA DIODES LAB HANGZHOU,CHINA CERAMIC/PZT SHINCHU,TAIWAN DC POWER LAB TAIPEI,TAIWAN