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CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
GENERAL DESCRIPTION
This of PWM modulator provides a complete pulse width modulation system in a single monolithic integrated circuit. This device includes a 5V reference accurate to 1%, two independent amplifiers usable for both voltage and current 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.
FEATURES
! ! ! ! ! ! ! ! Dual uncommitted 40V, 200mA output transistors. 1% accurate 5V reference. Dual error amplifiers. Wide range, variable dead time. Single-ended or push-pull operation. Under-voltage lockout with hysteresis. Double pulse protection. Master or slave oscillator operation.
APPLICATIONS
! ! ! ! ! ! Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drives
PIN CONFIGURATION
16-PIN PDIP/SOP (Top View)
1 2 3 4 5 6 7 8
1IN+
2IN+
16 15 14 13 12 11 10 9
1IN-
2IN-
FEEDBACK
REF
DTC CT
OUTPUT CTRL VCC
RT
C2
GND
E2
C1
E1
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Champion Microelectronic Corporation
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CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
BLOCK DIAGRAM
OUTPUT CTRL RT 6 CT 5 Dead-Time Control Comparator 4 DTC
+ _ Error Amplifier 1 0.1v + _ C1 ID Oscillator
FUNCTION TABLE Output Control
Q1 8
C1
13
Output Function Single-Ended or
Connected to : Ground
E1
9
Parallel Operation Push-Pull Alternating Output
VREF
1 1IN+ 2 1IN-
PWM Comparator Pulse-Steering Flip-Flop
Q2
11
C2
UM495A Steering Control Output Control at VREF Vs < 0.4V PWM Output at Q1 PWM Output at Q2 Vs > 2.4V Output Function
+ _
10
E2
Error Amplifier 2
12
VCC
16 2IN+ 15 2IN-
+ _
Reference Regulator 3
14 7
REF
FEEDBACK
GND
ORDERING INFORMATION
Part Number CM494CP CM494CS Temperature Range 0 to 70 0 to 70 Package 16-PIN DPIP (P16) 16-PIN SOP (S16)
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CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
ABSOULTE MAXIMUM RATINGS
Supply voltage, Vcc(Note 2).............................. 45V Amplifier input voltages........................ Vcc + 0.3V 41V 250mA 1000mW Collector output voltage................................. Collector output current.............................. Continuous total dissipation........................
@ (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............................................. 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. 260 Note 1: Over operating free air temperature range unless
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)... Timing capacitor, CT... 200mA Current into feedback terminal....................0.3mA 0.47nF to 10,000nF Timing resistor, RT....................1.8k to 500k Oscillator Frequency.....................1kHz to 300kHz Operating free air temperature UC494A, UC495A..................-55 to + 125 UC494AC, UC495AC...................0 to +70
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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 Reference Section Output voltage VREF Input regulation Output regulation Output voltage over temperature Short circuit output current Oscillator Section Frequency (Note 2) Standard deviation of frequency (Note 3) 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) Vcc = 40V, TA = 25 VID = -15mV to -5V, V (Pin 3) = 3.5V VID = -15mV to 5V, V (Pin 3) = 3.5V 65 0.3 -2 Vo (PIN 3) = 2.5V Vo (PIN 3) = 2.5V Vo (PIN 3) = 2.5V Vcc = 7V to 40V Vo = 3V, Vo = 0.5V to 3.5V .03 to Vcc -2 70 95 800 80 0.7 dB kHz dB mA mA 2 25 -0.2 10 250 -1 mV nA A V CT = 0.01F, RT = 12 All values of Vcc, CT, RT, TA Vcc = 7V to 40V, TA= 25 CT = 0.01F, RT = 12k, TA= Min. to Max V (PIN 4) = 0V to 5.25V V (PIN 4) = 0V Zero duty-cycle Maximum duty-cycle 0 45 3 3.3 -2 10 10 0.1 2 -10 kHz % % % A % V V lo = 1mA, TA= 25 Vcc = 7V to 40V lo = 1mA to 10mA TA= Min. to Max VREF = 0, TA= 25 4.90 10 35 4.75 5 2 1 5.25 25 15 5.10 50 V mV mV V mA TEST CONDITIONS MIN TYP MAX UNITS
Deadtime Control Section (Output control connected to VREF )
Deadtime control Section (cont.) Output control connected to VREF
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Champion Microelectronic Corporation
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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 Output Section Collector off-state current Emitter off-state current Collector-Emitter Saturation voltage Common-Emitter Emitter-follower VCE = 40V, Vcc = 40V Vcc = Vc = 40V, VE = 0 VE = 0, lc = 200mA Vc =15 V, lE = -200mA Vl = VREF Zero duty-cycle V (Pin 3) = 0.7V V (Pin 13) = 0.4V,Q1 ACTIVE V (Pin 13) = 2.4V,Q2 ACTIVE Deadband Zener Diode CircuitUC495A Breakdown voltage Sink current Total Device Standby supply current Under voltage lockout Hysteresis Switching CharacteristicsTA = 25 Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time Common-emitter configuration RL = 68, CL= 15pF Emitter-follower configuration RL= 68, CL= 15pF 100 25 100 40 200 100 200 100 ns ns ns ns Pin 6 at VREF, All other inputs and outputs open Vcc = 15V Vcc = 40V 3.5 300 6 9 10 15 6.5 mA mA V mV Vcc = 45V, lz = 2mA V (Pin 15) = 1V 36 0.2 39 0.3 .45 0.6 V mA 500 0.3 4 0.7 -200 300 1.1 1.5 2 100 -100 1.3 2.5 3.5 4.5 A A V V mA V mA A A mA TEST CONDITIONS MIN TYP MAX UNITS
Output control input current PWM Comparator Section Input threshold voltage (Pin 3) Input sink current (Pin 3) Steering Control Input current
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 (Xn -X) n=1
=
n-1
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CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
TYPICAL CHARACTERISTICS
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Champion Microelectronic Corporation
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CM494
ADVANCED REGULATING PULSE WIDTH MODULATOR
PACKAGE DIMENSION
16-PIN PDIP (P16)
PIN 1 ID
16-PIN SOP (S16)
PIN 1 ID
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CERAMIC/SURGE ABSORBER SHANGHAI,CHINA
DIODES LAB HANGZHOU,CHINA
CERAMIC/PZT SHINCHU,TAIWAN
DC POWER LAB TAIPEI,TAIWAN

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