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Part: CS2842ALN8
Category:
Power Management
-> AC-DC Controllers/Converters
-> AC-DC Switching
-> Off-Line Controllers
Description: Off-line Current Mode PWM Control Circuit With Undervoltage Lockout , Package: Soic, Pins=14
Company: ON Semiconductor
Datasheet: Download CS2842ALN8 datasheet File size : 243 kB
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Datasheet text preview:
CS2842A, CS3842A, CS2843A, CS3843A Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout
The CS284XA, CS384XA provides all the necessary features to implement offline fixed frequency currentmode control with a minimum number of external components. The CS384XA family incorporates a new precision t e m p e r a t u r e c o n t r o l l e d oscillator with an internally trimmed discharge current to minimize variations in frequency. A precision dutycycle clamp eliminates the need for an external oscillator when a 50% dutycycle is used. Dutycycles 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. Other features include low startup current, pulsebypulse current limiting, and a highcurrent totem pole output for driving capacitive loads, such as the gate of power MOSFET. The output is LOW in the off state, consistent with Nchannel devices. The CS384XA series of currentmode control ICs are available in 8 and14 lead packages for surface mount (SO) applications as well as 8 lead PDIP packages. Features · Optimized for Offline Control · Internally Trimmed Temperature Compensated Oscillator · Maximum DutyCycle Clamp · VREF Stabilized Before Output Stage is Enabled · Low Startup Current · PulseByPulse Current Limiting · Improved Undervoltage Lockout · Double Pulse Suppression · 1.0% Trimmed Bandgap Reference · High Current Totem Pole Output
http://onsemi.com MARKING DIAGRAM
8 DIP8 N SUFFIX CASE 626 1 SO8 D SUFFIX CASE 751 1 14 SO14 D SUFFIX CASE 751A 1 x y A WL, L YY, Y WW, W = 2 or 3 = 2 or 3 = Assembly Location = Wafer Lot = Year = Work Week CSx84yA AWLYWW 1 8 x84yA ALYWX x84yA AWL YYWW
8
8 1
14 1
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2001
1
June, 2001 Rev. 3
Publication Order Number: CS2842A/D
CS2842A, CS3842A, CS2843A, CS3843A
PIN CONNECTIONS
DIP8 & SO8 COMP VFB Sense OSC 1 8 1 VREF VCC VOUT GND COMP NC VFB NC Sense NC OSC SO14 14 VREF NC VCC VCC Pwr VOUT Pwr GND GND
VCC 34 V
Undervoltage Lockout Circuit Set/ Reset 5.0 V Reference Internal Bias Output Enable
VCC Pwr
VREF
GND 16 V/10 V (8.4 V/7.6 V) 2.50 V
OSC
Oscillator
NOR VOUT
+ VFB COMP Error Amplifier VC
2R
S R PWM Latch Pwr GND
R 1.0 V Current Sensing Comparator
Sense ( ) Indicates CS2843A/3843A
Figure 1. Block Diagram
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CS2842A, CS3842A, CS2843A, CS3843A
MAXIMUM RATINGS*
Rating Supply Voltage (ICC < 30 mA) Supply Voltage (Low Impedance Source) Output Current Output Energy (Capacitive Load) Analog Inputs (VFB, Sense) Error Amp Output Sink Current Package Thermal Resistance, PDIP8 JunctiontoCase, RJC JunctiontoAmbient, RJA Package Thermal Resistance, SO8 JunctiontoCase, RJC JunctiontoAmbient, RJA Package Thermal Resistance, SO14 JunctiontoCase, RJC JunctiontoAmbient, RJA Lead Temperature Soldering: 1. 10 second maximum. 2. 60 second maximum 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 Self Limiting 30 ±1.0 5.0 0.3 to + 5.5 10 52 100 45 165 30 125 260 peak 230 peak Unit V A µJ V mA °CW °CW °CW °CW °CW °CW °C °C
ELECTRICAL CHARACTERISTICS (25° TA 85° for CS2842A/CS2843A, 0° TA 70° for CS3842A/CS3843A.
VCC = 15 V*; RT = 680 , CT = 0.022 µF for triangular mode, RT = 10 k, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) CS2842A/CS2843A 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 Voltage Stability Temperature Stability Amplitude Discharge Current Sawtooth Mode (see Figure 7), TJ = 25°C Triangular Mode (see Figure 7), TJ = 25°C 12 VCC 25 V Sawtooth Mode TMIN TA TMAX (Note 3.) Triangular Mode TMIN TA TMAX (Note 3.) OSC peak to peak TJ = 25°C TMIN TA TMAX 47 47 7.5 7.2 52 52 0.2 5.0 8.0 1.7 8.3 57 57 1.0 9.3 9.5 47 44 7.5 7.2 52 52 0.2 5.0 8.0 1.7 8.3 57 60 1.0 9.3 9.5 kHz kHz % % % V mA mA TJ = 25°C, IOUT = 1.0 mA 12 VIN 25 V 1.0 IOUT 20 mA Note 3. Line, Load, Temperature (Note 3.) 10 Hz f 10 kHz, TJ = 25°C (Note 3.) TA = 125°C, 1.0 kHrs. (Note 3.) TA = 25°C 4.95 4.90 30 5.00 6.0 6.0 0.2 50 5.0 100 5.05 20 25 0.4 5.10 25 180 4.90 4.82 30 5.00 6.0 6.0 0.2 50 5.0 100 5.10 20 25 0.4 5.18 25 180 V mV mV mV/°C V µV mV mA Test Conditions Min Typ Max
CS3842A/CS3843A Min Typ Max Unit
3. These parameters, although guaranteed, are not 100% tested in production. *Adjust VCC above the start threshold before setting at 15 V.
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CS2842A, CS3842A, CS2843A, CS3843A
ELECTRICAL CHARACTERISTICS (continued) (25° TA 85° for CS2842A/CS2843A, 0° TA 70° for CS3842A/CS3843A.
VCC = 15 V*; RT = 680 , CT = 0.022 µF for triangular mode, RT = 10 k, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) CS2842A/CS2843A Characteristic 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 Output Section Output Low Level Output High Level Rise Time Fall Time Output Leakage Total Standby Current Startup Current Operating Supply Current VCC Zener Voltage VFB = VSENSE = 0 V, RT = 10 k, CT = 3.3 nF ICC = 25 mA 11 0.5 17 34 1.0 11 0.5 17 34 1.0 mA mA V ISINK = 20 mA ISINK = 200 mA ISOURCE = 20 mA ISOURCE = 200 mA TJ = 25°C, CL = 1.0 nF (Note 4.) TJ = 25°C, CL = 1.0 nF (Note 4.) UVLO Active, VOUT = 0 13 12 0.1 1.5 13.5 13.5 50 50 0.01 0.4 2.2 150 150 10.00 13 12 0.1 1.5 13.5 13.5 50 50 0.01 0.4 2.2 150 150 10.00 V V V V ns ns µA Notes 5 & 6. VCOMP = 5.0 V (Note 5.) 12 VCC 25 V (Note 5.) VSENSE = 0 TJ = 25°C (Note 4.) 2.85 0.9 3.00 1.0 70 2.0 150 3.15 1.1 10 300 2.85 0.9 3.00 1.0 70 2.0 150 3.15 1.1 10 300 V/V V dB µA ns VCOMP = 2.5 V VFB = 0 2.0 VOUT 4.0 V Note 4. 12 VCC 25 V VFB = 2.7 V, VCOMP = 1.1 V VFB = 2.3 V, VCOMP = 5.0 V VFB = 2.3 V, 15 k to ground VFB = 2.7 V, 15 k to VREF 2.45 65 0.7 60 2.0 0.5 5.0 2.50 0.3 90 1.0 70 6.0 0.8 6.0 0.7 2.55 1.0 1.1 2.42 65 0.7 60 2.0 0.5 5.0 2.50 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 Test Conditions Min Typ Max
CS3842A/CS3843A Min Typ Max Unit
4. These parameters, although guaranteed, are not 100% tested in production. 5. Parameters measured at trip point of latch with VFB = 0. 6. Gain defined as: A = VCOMP/VSENSE; 0 VSENSE 0.8 V. *Adjust VCC above the start threshold before setting at 15 V.
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CS2842A, CS3842A, CS2843A, CS3843A
VCC = 15 V*; RT = 680 , CT = 0.022 µF for triangular mode, RT = 10 k, CT = 3.3 nF for sawtooth mode (see Figure 7); unless otherwise stated.) CS2842A Characteristic Test Conditions Min Typ Max Min CS3842A Typ Max
ELECTRICAL CHARACTERISTICS (continued) (25° TA 85° for CS2842A/CS2843A, 0° TA 70° for CS3842A/CS3843A.
CS2843A/CS3843A Min Typ Max Unit
Undervoltage Lockout Section Start Threshold Min. Operating Voltage After Turn On 15 9.0 16 10 17 11 14.5 8.5 16 10 17.5 11.5 7.8 7.0 8.4 7.6 9.0 8.2 V V
*Adjust VCC above the start threshold before setting at 15 V.
PACKAGE PIN DESCRIPTION
Package Pin Number DIP8 1 2 3 4 5 6 7 8 SO8 1 2 3 4 5 6 7 8 SO14 1 3 5 7 8 9
Frequency (kHz)
Duty Cycle (%)
100
200
300 400 500
700
CT (µF)
RT ()
Figure 2. Oscillator Frequency vs. CT
Figure 3. Oscillator Duty Cycle vs. RT
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10 k
1k
2k
3k 4k 5k
7k
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COMP VFB Error amp output, used to compensate error amplifier. Error amp inverting input. Sense OSC Noninverting input to Current Sense Comparator. Oscillator timing network with capacitor to ground, resistor to VREF. Ground. GND Pwr GND VOUT Output driver ground. Output drive pin. 10 11 VCC Pwr VCC Output driver positive supply. Positive power supply. 12 14 VREF NC Output of 5.0 V internal reference. No connection. 2, 4, 6, 13
Symbol
Description
TYPICAL PERFORMANCE CHARACTERISTICS
900 800 700 600 500 400 300 200 100 .0005 .001 .002 .003 .005 .01 .02 .03 .04 .05 RT = 10 k RT = 1.5 k RT = 680
100 90 80 70 60 50 40 30 20 10
Others parts begin by cs
CS-1 CS-2 CS-3 CS-4 CS-5 CS-6 CS-7 CS-8 CS-9 CS-10 CS-11 CS-12 CS-13 CS-14 CS-15 CS-16
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