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Part: CS2841BEBN8
Category:
Power Management
-> AC-DC Controllers/Converters
-> AC-DC Switching
-> Off-Line Controllers
Description: Automotive Current Mode PWM Control Circuit , Package: Pdip, Pins=8
Company: ON Semiconductor
Datasheet: Download CS2841BEBN8 datasheet File size : 243 kB
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Datasheet text preview:
CS2841B Automotive Current Mode PWM Control Circuit
The CS2841B provides all the necessary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The CS2841B (a variation of the CS2843A) is designed specifically for use in automotive operation. The low start threshold voltage of 8.0 V (typ), and the ability to survive 40 V automotive load dump transients are important for automotive subsystem designs. The CS2841 series has a history of quality and reliability in automotive applications. The CS2841B incorporates a precision temperature-controlled oscillator with an internally trimmed discharge current to minimize variations in frequency. Duty-cycles greater than 50% are also possible. On board logic ensures that VREF is stabilized before the output stage is enabled. Ion implant resistors provide tighter control of undervoltage lockout. Features · Optimized for Off-Line Control · Internally Trimmed Temperature Compensated Oscillator · Maximum Duty-Cycle Clamp · VREF Stabilized Before Output Stage Enabled · Low Start-Up Current · Pulse-By-Pulse Current Limiting · Improved Undervoltage Lockout · Double Pulse Suppression · 1.0 % Trimmed Bandgap Reference · High Current Totem Pole Output
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8 1
DIP-8 N SUFFIX CASE 626
14 1
SO-14 D SUFFIX CASE 751A
PIN CONNECTIONS AND MARKING DIAGRAM
1 COMP CS2841B AWL YYWW DIP-8 1 COMP NC VFB NC Sense NC OSC CS2841B AWLYWW SO-14 A WL, L YY, Y WW, W = Assembly Location = Wafer Lot = Year = Work Week 14 VREF NC VCC VCC Pwr VOUT Pwr GND GND VFB Sense OSC 8 VREF VCC VOUT GND
ORDERING INFORMATION
Device CS2841BEBN8 CS2841BED14 CS2841BEDR14 Package DIP-8 SO-14 SO-14 Shipping 50 Units/Rail 55 Units/Rail 2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2003
1
May, 2003 - Rev. 6
Publication Order Number: CS2841B/D
CS2841B
VCC VCC Pwr
Undervoltage Lockout Circuit Set/ Reset 8.0 V/7.4 V 2.5 V Output Enable NOR 5.0 V Reference Internal Bias
GND
VREF
OSC
Oscillator S
VOUT + Error Amplifier 2R VC R R 1.0 V Current Sensing Comparator PWM Latch Pwr GND
VFB
COMP Sense
Figure 1. Block Diagram
MAXIMUM RATINGS*
Rating Supply Voltage (Low Impedance Source) Output Current Output Energy (Capacitive Load) Analog Inputs (VFB, Sense) Error Amp Output Sink Current Lead Temperature Soldering 1. 10 seconds max. 2. 60 seconds max above 183°C *The maximum package power dissipation must be observed. Wave Solder (through hole styles only) Note 1 Reflow (SMD styles only) Note 2 Value 40 ±1.0 5.0 -0.3 to 5.5 10 260 peak 230 peak Unit V A µJ V mA °C °C
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CS2841B
ELECTRICAL CHARACTERISTICS (-40 °C TA 85°C, RT = 680 k, CT = 0.022 µF for Triangular Mode, VCC = 15 V (Note 3), RT = 10 k, CT = 3.3 nF for Sawtooth Mode (see Figure 7); unless otherwise specified.)
Characteristic Reference Section Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit Oscillator Section Initial Accuracy Sawtooth Mode: TJ = 25°C. See Figure 7. Sawtooth Mode: -40°C TA +85°C Triangular Mode: TJ =25°C. See Figure 7. 8.4 VCC 16 V Sawtooth Mode: TMIN TA TMAX. Note 4 Triangular Mode: TMIN TA TMAX. Note 4 VOSC (Peak to Peak) TJ = 25°C TMIN TA TMAX 47 44 44 7.4 7.2 52 52 52 0.2 5.0 8.0 1.7 8.3 57 60 60 1.0 9.2 9.4 kHz kHz kHz % % % V mA mA TJ = 25°C, IOUT = 1.0 mA 8.4 VCC 16 V 1.0 IOUT 20 mA Note 4 Line, Load, Temp. Note 4 10 Hz f 10 kHz, TJ = 25°C. Note 4 TA = 125°C, 1000 Hrs. Note 4 TA = 25°C 4.9 4.82 -30 5.0 6.0 6.0 0.2 50 5.0 -100 5.1 20 25 0.4 5.18 25 -180 V mV mV mV/°C V µV mV mA Test Conditions Min Typ Max Unit
Voltage Stability Temperature Stability Amplitude Discharge Current Error Amp Section Input Voltage Input Bias Current AVOL Unity Gain Bandwidth PSRR Output Sink Current Output Source Current VOUT High VOUT Low Current Sense Section Gain Maximum Input Signal PSRR Input Bias Current Delay to Output 3. 4. 5. 6.
VCOMP = 2.5 V VFB = 0 V 2.0 VOUT 4.0 V Note 4 8.4 V VCC 16 V VFB = 2.7 V, VCOMP = 1.1 V VFB = 2.3 V, VCOMP = 5.0 V VFB = 2.3 V, RL = 15 k to Ground VFB = 2.7 V, RL = 15 k to VREF
2.42 65 0.7 60 2.0 -0.5 5.0 -
2.5 -0.3 90 1.0 70 6.0 -0.8 6.0 0.7
2.58 -2.0 1.1
V µA dB MHz dB mA mA V V
Notes 5 and 6 VCOMP = 5.0 V. Note 5 12 V VCC 25 V. Note 5 VSense = 0 V TJ = 25°C. Note 4
2.85 0.9 -
3.0 1.0 70 -2.0 150
3.15 1.1 -10 300
V/V V dB µA ns
Adjust VCC above the start threshold before setting at 15 V. These parameters, although guaranteed, are not 100% tested in production. Parameter measured at trip point of latch with VFB = 0. Gain defined as: A+ DVCOMP ; 0 v VSense v 0.8 V. DVSense
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CS2841B
ELECTRICAL CHARACTERISTICS (continued) (-40 °C TA 85°C, RT = 680 k, CT = 0.022 µF for Triangular Mode, VCC = 15 V (Note 3), RT = 10 k, CT = 3.3 nF for Sawtooth Mode (see Figure 7); unless otherwise specified.)
Characteristic Output Section Output Low Level Output High Level Rise Time Fall Time Output Leakage Total Standby Current Start-Up Current Operating Supply Current ICC Undervoltage Lockout Section Start Threshold Min. Operating Voltage After Turn On 7.6 7.0 8.0 7.4 8.4 7.8 V V VFB = VSense = 0 V, RT = 10 k, CT = 3.3 nF 0.5 11 1.0 17 mA mA ISINK = 20 mA ISINK = 200 mA ISOURCE = 20 mA ISOURCE = 200 mA TJ = 25°C, CL = 1.0 nF. Note 7 TJ = 25°C, CL = 1.0 nF. Note 7 Undervoltage Active, VOUT = 0 13 12 0.1 1.5 13.5 13.5 50 50 -0.01 0.4 2.2 150 150 -10 V V V V ns ns µA Test Conditions Min Typ Max Unit
7. These parameters, although guaranteed, are not 100% tested in production.
PACKAGE PIN DESCRIPTION
PACKAGE PIN # DIP-8 1 2 3 4 5 SO-14 1 3 5 7 8 9 6 10 11 7 8 12 14 2, 4, 6, 13 PIN SYMBOL COMP VFB Sense OSC GND Pwr GND VOUT VCC Pwr VCC VREF NC FUNCTION Error amp output, used to compensate error amplifier. Error amp inverting input. Noninverting input to Current Sense Comparator. Oscillator timing network with Capacitor to Ground, resistor to VREF. Ground. Output driver Ground. Output drive pin. Output driver positive supply. Positive power supply. Output of 5.0 V internal reference. No connection.
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CS2841B
TYPICAL PERFORMANCE CHARACTERISTICS
100 RT = 680 Duty Cycle (%) .002 .003 .005 CT (µF) .01 .02 .03 .04 .05 90 80 70 60 50 40 30 RT = 10 k 20 10 100 200 300 400 500 700 10 k 1k 2k 3k 4k 5k 7k VCC GND CT
900 800 Frequency (kHz) 700 600 500 400 300 200 100 .0005 .001 RT = 1.5 k
RT ()
Figure 2. Oscillator Frequency vs. CT
Figure 3. Oscillator Duty Cycle vs. RT
VREF
RT 2N2222 4.7 k 100 k COMP 1.0 k Error Amp Adjust 5.0 k Sense Adjust VREF 0.1 µF VFB CS2841B Sense VOUT VCC 0.1 µF 1.0 k 1.0 W VOUT A
4.7 k
OSC
GND
Figure 4. Test Circuit
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5
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