TL494, NCV494 SWITCHMODE Pulse Width Modulation Control Circuit

Transcription

1 SWITCHMODE Pulse Width Modulation Control Circuit The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. Features Complete Pulse Width Modulation Control Circuitry OnChip Oscillator with Master or Slave Operation OnChip Error Amplifiers OnChip 5.0 V Reference Adjustable Deadtime Control Uncommitted Output Transistors Rated to 500 Source or Sink Output Control for PushPull or SingleEnded Operation Undervoltage Lockout NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes PbFree Packages are Available* MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted.) Rating Symbol Value Unit Power Supply Voltage V CC 42 V Collector Output Voltage V C, V C2 42 V Collector Output Current (Each transistor) (Note ) I C, I C2 500 Amplifier Voltage Range V IR 0.3 to +42 V Power T A 45 C P D 000 mw Thermal Resistance, JunctiontoAmbient R JA 80 C/W Operating Junction Temperature T J 25 C Storage Temperature Range T stg 55 to +25 C Operating Ambient Temperature Range T A C TL494B TL494C TL494I NCV494B 40 to to to to +25 Derating Ambient Temperature T A 45 C Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.. Maximum thermal limits must be observed. x A WL YY, Y WW, W G SOIC6 D SUFFIX CASE 75B PDIP6 N SUFFIX CASE MARKING DIAGRAMS TL494xDG AWLYWW = B, C or I = Assembly Location = Wafer Lot = Year = Work Week = PbFree Package *This marking diagram also applies to NCV494. Noninv Inv Compen/PWN Comp 2 PIN CONNECTIONS + Error Amp 2 Error + Amp V CC 5.0 V REF V Deadtime Control 4 3 C T 5 2 Oscillator R T 6 Q2 Ground C 7 8 Q 0 9 (Top View) 6 * TL494xN AWLYYWWG 6 5 Noninv Inv V ref Output Contro l V CC C2 E2 E *For additional information on our PbFree strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 4 of this data sheet. Semiconductor Components Industries, LLC, 2005 Publication Order Number: TL494/D

2 RECOMMENDED OPERATING CONDITIONS Power Supply Voltage V CC V Collector Output Voltage V C, V C V Collector Output Current (Each transistor) I C, I C2 200 Amplified Voltage V in 0.3 V CC 2.0 V Current Into Feedback Terminal l fb 0.3 Reference Output Current l ref 0 Timing Resistor R T k Timing Capacitor C T F Oscillator Frequency f osc khz ELECTRICAL CHARACTERISTICS (V CC = 5 V, C T = 0.0 F, R T = 2 k, unless otherwise noted.) For typical values T A = 25 C, for min/max values T A is the operating ambient temperature range that applies, unless otherwise noted. REFERENCE SECTION Reference Voltage (I O =.0 ) V ref V Line Regulation (V CC = 7.0 V to 40 V) Reg line mv Load Regulation (I O =.0 to 0 ) Reg load mv Short Circuit Output Current (V ref = 0 V) I SC OUTPUT SECTION Collector OffState Current (V CC = 40 V, V CE = 40 V) Emitter OffState Current V CC = 40 V, V C = 40 V, V E = 0 V) I C(off) A I E(off) 00 A CollectorEmitter Saturation Voltage (Note 2) CommonEmitter (V E = 0 V, I C = 200 ) EmitterFollower (V C = 5 V, I E = 200 ) V sat(c) V sat(e) V Output Control Pin Current Low State (V OC 0.4 V) High State (V OC = V ref ) I OCL I OCH A Output Voltage Rise Time CommonEmitter (See Figure 2) EmitterFollower (See Figure 3) t r ns Output Voltage Fall Time CommonEmitter (See Figure 2) EmitterFollower (See Figure 3) t f ns 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 2

3 ELECTRICAL CHARACTERISTICS (V CC = 5 V, C T = 0.0 F, R T = 2 k, unless otherwise noted.) For typical values T A = 25 C, for min/max values T A is the operating ambient temperature range that applies, unless otherwise noted. ERROR AMPLIFIER SECTION Offset Voltage (V O (Pin 3) = 2.5 V) V IO mv Offset Current (V O (Pin 3) = 2.5 V) I IO na Bias Current (V O (Pin 3) = 2.5 V) I IB 0..0 A Common Mode Voltage Range (V CC = 40 V, T A = 25 C) V ICR 0.3 to V CC 2.0 V Open Loop Voltage Gain ( V O = 3.0 V, V O = 0.5 V to 3.5 V, R L = 2.0 k ) A VOL db UnityGain Crossover Frequency (V O = 0.5 V to 3.5 V, R L = 2.0 k ) f C 350 khz Phase Margin at UnityGain (V O = 0.5 V to 3.5 V, R L = 2.0 k ) m 65 deg. Common Mode Rejection Ratio (V CC = 40 V) CMRR db Power Supply Rejection Ratio ( V CC = 33 V, V O = 2.5 V, R L = 2.0 k ) PSRR 00 db Output Sink Current (V O (Pin 3) = 0.7 V) I O Output Source Current (V O (Pin 3) = 3.5 V) I O PWM COMPARATOR SECTION (Test Circuit Figure ) Threshold Voltage (Zero Duty Cycle) V TH V Sink Current (V (Pin 3) = 0.7 V) I I DEADTIME CONTROL SECTION (Test Circuit Figure ) Bias Current (Pin 4) (V Pin 4 = 0 V to 5.25 V) I IB (DT) A Maximum Duty Cycle, Each Output, PushPull Mode (V Pin 4 = 0 V, C T = 0.0 F, R T = 2 k ) (V Pin 4 = 0 V, C T = 0.00 F, R T = 30 k ) Threshold Voltage (Pin 4) (Zero Duty Cycle) (Maximum Duty Cycle) DC max 45 OSCILLATOR SECTION Frequency (C T = 0.00 F, R T = 30 k ) f osc 40 khz Standard Deviation of Frequency* (C T = 0.00 F, R T = 30 k ) f osc 3.0 % Frequency Change with Voltage (V CC = 7.0 V to 40 V, T A = 25 C) f osc ( V) 0. % Frequency Change with Temperature ( T A = T low to T high ) (C T = 0.0 F, R T = 2 k ) V th f osc ( T) 2 % UNDERVOLTAGE LOCKOUT SECTION TurnOn Threshold (V CC increasing, I ref =.0 ) V th V % V TOTAL DEVICE Standby Supply Current (Pin 6 at V ref, All other inputs and outputs open) (V CC = 5 V) (V CC = 40 V) I CC Average Supply Current (C T = 0.0 F, R T = 2 k, V (Pin 4) = 2.0 V) (V CC = 5 V) (See Figure 2) 7.0 * Standard deviation is a measure of the statistical distribution about the mean as derived from the formula, N (X n X) 2 n = N 3

4 ORDERING INFORMATION Device Package Shipping TL494BD SOIC6 48 Units / Rail TL494BDG SOIC6 (PbFree) 48 Units / Rail TL494BDR2 SOIC6 TL494BDR2G SOIC6 (PbFree) TL494CD SOIC6 48 Units / Rail TL494CDG SOIC6 (PbFree) 48 Units / Rail TL494CDR2 SOIC6 TL494CDR2G SOIC6 (PbFree) TL494CN PDIP6 25 Units / Rail TL494CNG PDIP6 (PbFree) 25 Units / Rail TL494IN PDIP6 25 Units / Rail TL494ING PDIP6 (PbFree) 25 Units / Rail NCV494BDR2* SOIC6 NCV494BDR2G* SOIC6 (PbFree) For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD80/D. *NCV494: T low = 40 C, T high = +25 C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control. 4

5 PACKAGE DIMENSIONS PDIP6 N SUFFIX CASE ISSUE T 6 A 8 9 B NOTES:. DIMENSIONING AND TOLERANCING PER ANSI Y4.5M, CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. H G F S C K SEATING T PLANE D 6 PL 0.25 (0.00) M T A M J L M INCHES MILLIMETERS DIM MIN MAX MIN MAX A B C D F G 0.00 BSC 2.54 BSC H BSC.27 BSC J K L M S