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 sensing, an externally synchronizable oscillator with its linear ramp generator, and two-uncommitted transistor output switches. These two outputs may be operated either in parallel for single-ended operation or alternating 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. ! Dual error amplifiers. ! Single-ended or push-pull operation. ! Under-voltage lockout with hysteresis. ! Double pulse protection. ! Master or slave oscillator operation. independent amplifiers usable for both voltage and current ! Wide range, variable dead time. APPLICATIONS ! Linear Regulators ! Adjustable Supplies ! Switching Power Supplies ! Battery Operated Computers ! Instrumentation ! Computer Disk Drives PIN CONFIGURATION 16-PIN PDIP/SOP (Top View) 123456781IN+1IN-FEEDBACKDTCCTRTGNDC12IN+2IN-REF161514131211109OUTPUT CTRLVCCC2E2E1 2000/12/29 Preliminary Champion Microelectronic Corporation

Page 1

CM494

ADVANCED REGULATING PULSE WIDTH MODULATOR

BLOCK DIAGRAM RT 6CT 5Dead-Time Control Comparator4DTC + _0.1v + _C1IDOUTPUT CTRLOscillator13FUNCTION TABLE Output Control Q18C1Output Function Single-Ended or Parallel Operation Push-Pull Alternating Output Connected to : Ground E19VREF Error Amplifier 1 PWM Comparator 1 10 +1IN+1IN- 2 _Q211C2UM495A Output Function Pulse-Steering Flip-FlopError Amplifier 2E2Steering Control （Output Control at VREF） Vs < 0.4V 122IN+2IN-1615VCC + _ReferenceRegulator147PWM Output at Q1 PWM Output at Q2 REFGNDVs > 2.4V FEEDBACK3ORDERING INFORMATION Part Number Temperature Range Package 16-PIN DPIP (P16) 16-PIN SOP (S16) CM494CP 0℃ to 70℃ CM494CS 0℃ to 70℃ 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 500kΩ Timing resistor, RT………………..1.8kΩ to

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

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, over recommended operating free-air temperature range. Vcc = 15V, f = 10Khz, TA=TJ. Reference Section Output voltage VREF Input regulation Output regulation Output voltage over temperature Short circuit output current Oscillator Section Frequency (Note 2) Frequency change with voltage Frequency change with temperature Input bias current (Pin 4) Maximum duty-cycle (each output) Input threshold voltage (Pin 4) Amplifier Section Input offset voltage Input offset current Input bias current Common-mode input voltage range Open loop voltage gain Unity gain bandwidth Common-mode rejection ratio Output sink current (Pin 3) Output Source current (Pin 3) ΔVo = 3V, Vo = 0.5V to 3.5V VID = -15mV to –5V, V (Pin 3) = 3.5V VID = -15mV to 5V, V (Pin 3) = 3.5V Vo (PIN 3) = 2.5V Vo (PIN 3) = 2.5V Vo (PIN 3) = 2.5V Vcc = 7V to 40V .03 to Vcc -2 70 0.3 -2 95 800 0.7 dB kHz mA mA 2 25 -0.2 10 250 -1 mV nA µA Standard deviation of frequency (Note 3) All values of Vcc, CT, RT, TA CT = 0.01µF, RT = 12kΩ, ΔTA= Min. to Max V (PIN 4) = 0V to 5.25V V (PIN 4) = 0V Zero duty-cycle Maximum duty-cycle 45 0 10 -2 3 2 -10 3.3 % % µA % V V Vcc = 7V to 40V lo = 1mA to 10mA ΔTA= Min. to Max 4.90 2 1 25 15 5.10 mV mV V ADVANCED REGULATING PULSE WIDTH MODULATOR

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS lo = 1mA, TA= 25℃ 4.75 5 5.25 V VREF = 0, TA= 25℃ 10 35 50 mA CT = 0.01µF, RT = 12Ω 10 kHz Vcc = 7V to 40V, TA= 25℃ 0.1 % Deadtime Control Section (Output control connected to VREF ) Deadtime control Section (cont.) （Output control connected to VREF） V Vcc = 40V, TA = 25℃ 65 80 dB 2000/12/29 Preliminary Champion Microelectronic Corporation

Page 4

CM494

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, over recommended operating free-air temperature range. Vcc = 15V, f = 10Khz, TA=TJ Output Section Collector off-state current Emitter off-state current Collector-Emitter Saturation voltage Emitter-follower VCE = 40V, Vcc = 40V Vcc = Vc = 40V, VE = 0 Vc =15 V, lE = -200mA 2 1.1 1.5 100 -100 1.3 2.5 µA µA V V ADVANCED REGULATING PULSE WIDTH MODULATOR

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Common-Emitter VE = 0, lc = 200mA Output control input current PWM Comparator Section Input threshold voltage (Pin 3) Input sink current (Pin 3) Steering Control Input current Deadband Zener Diode Circuit（UC495A） Breakdown voltage Sink current Total Device Standby supply current Under voltage lockout Hysteresis Switching Characteristics（TA = 25℃） Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time Vl = VREF 3.5 mA Zero duty-cycle V (Pin 3) = 0.7V 0.3 4 0.7 4.5 V mA V (Pin 13) = 0.4V,Q1 ACTIVE -200 µA Vcc = 45V, lz = 2mA V (Pin 15) = 1V Pin 6 at VREF, All other inputs Vcc = 15V and outputs open Common-emitter configuration RL = 68Ω, CL= 15pF Emitter-follower configuration RL= 68Ω, CL= 15pF Vcc = 40V 36 0.2 3.5 500 39 0.3 6 9 300 100 25 100 40 .45 0.6 10 15 6.5 200 100 200 100 mA V mA mA mA V mV ns ns ns ns V (Pin 13) = 2.4V,Q2 ACTIVE 300 µA 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: σ = n 2 Σ(Xn -X) n=1 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 IDθθ 16-PIN SOP (S16) PIN 1 IDθθ 2000/12/29 Preliminary Champion Microelectronic Corporation

Page 7

CM494

ADVANCED REGULATING PULSE WIDTH MODULATOR

IMPORTANT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards. HsinChu Headquarter 5F-1, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan TEL: +886-3-567 9979 FAX: +886-3-567 9909 Sales & Marketing 11F, No. 306-3, SEC. 1, Ta Tung Road, Hsichih, Taipei Hsien 221, Taiwan TEL: +886-2-8692 1591 FAX: +886-2-8692 1596 2000/12/29 Preliminary Champion Microelectronic Corporation

Page 8