SG6840 ETC, SG6840 Datasheet
SG6840
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SG6840 Summary of contents
Page 1
... Start-up current has been reduced to 30uA typical and operating current has been shrunk to 3mA. The SG6840 is a fixed frequency PWM controller in normal operation; its patented green-mode function will decrease the PWM frequency in response to the decrease of the load ...
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... SG6840 PIN DESCRIPTIONS Name Pin No. VDD 7 VIN 3 www.DataSheet4U.com FB 2 Sense Gate GND 1 BLOCK DIAGRAM VIN 3 VDD 2002 System General Corporation Type Function Supply Power supply. The start-up current input. A start-up resistor is connected from the Analog in- line-input to this pin, such as 1.5MΩ for off-line converter. Adjust the ...
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... SG6840 ABSOLUTE MAXIMUM RATINGS Symbol VDD Iout Sense Tstg Note: All voltage values, except differential voltage, are with respect to network ground terminal. ELECTRCIAL CHARACTERISTICS(VDD=15V, TA=25) Feedback Input Section Symbol Av Input-voltage to current-sense attenuation ...
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... SG6840 PWM Section Symbol DC (MAX) DC (MIN) Bnk Output Section Symbol Vol Voh tr tf Under-voltage Lockout Section Symbol V TH(ON) V DD(min) Over-temperature Protection Section Symbol Irt Vtov Threshold voltage for over-temperature Total Standby Current Section ...
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... SG6840 Start-up Current (I 25.5 25.0 24.5 24.0 23.5 www.DataSheet4U.com 23.0 22.5 22.0 -40 -25 -10 FB Voltage vs Frequency 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 PWM Oscillator Frequency (Fosc) vs 64.4 64.3 64.2 64.1 64.0 63.9 63.8 63.7 -40 -25 -10 2002 System General Corporation ) vs Tem perature 110 125 TEMPERATURE ( ℃ VOLTAGE (V) Tem perature 110 125 TEMPERATURE ( ℃ Ver1 ...
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... SG6840 Min. Operating Voltage (V 10.20 10.15 10.10 10.05 10.00 9.95 9.90 www.DataSheet4U.com 9.85 9.80 9.75 9.70 -40 -25 -10 RT Voltage vs Ton 0.620 0.628 V OTP, STOP 0.63 0.62 0.62 0.61 0.61 0.60 0.60 -40 -25 -10 2002 System General Corporation ) vs DD(min) Tem perature 110 125 TEMPERATURE ( ℃ ) 0.636 0.644 0.652 0.660 RT VOLTAGE (V) vs Tem perature 5 20 ...
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... Product Specification Current sensing and PWM current limiting SG6840 consists of two feedback loops: voltage loop and current loop, to control the load regulation. SG6840’s cur- rent sense input is designed for the current-mode control. A current-to-voltage conversion is done externally through a current-sense resistor Rs. Under normal operation, the FB ...
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... Noise on the current sense or control signal can cause sig- nificant pulse width jitter, particularly with the continuous- mode operation. While slope compensation helps alleviate this problem. Note that the SG6840 has a single ground pin. High sink current in the output therefore cannot be returned separately. Good high frequency or RF layout practices should be followed ...
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... R8,R12 EC 680u/16V R9 EC 10u/25V R10 LED THER1 ZD 12V T1 FUSE 2A/250V U1 UU10.5 U2 L04 U3 DIODE VZ1 - 9 - Ver1.0 Product Specification Component MOS 2A/600V R 470Kohm 1/4W R 47ohm 1/4W R 22ohm 1/4W R 4.7Kohm 1/4W R 0.5ohm 1W R 510Kohm 1/4W R 20Kohm 1/ 100ohm 1/8W Thermistor SCK054 Transformer EI28 IC SG6840 IC 4N35D IC TL431 VZ 9G http://www.sg.com.tw ...
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... SG6840 MECHANICAL DIMENSIONS 8 PINS – PLASTIC DIP (D) 8 www.DataSheet4U.com 1 e Symbol Min 3 0.4 b2 0.25 d 0∘ 2.29 H 2002 System General Corporation Millimeter Typ. Max. 3.4 4.5 1.5 0.5 0.6 0.3 0.4 15∘ 9.3 6.5 2.54 2.79 7 Ver1.0 Product Specification Inch Min. Typ. Max. ...
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... SG6840 MECHANICAL DIMENSIONS 8 PINS – PLASTIC SMD (S) Dimension: www.DataSheet4U.com Symbol 2002 System General Corporation Millimeter Min. Typ. Max. 1.35 1.63 1.75 0.10 0.15 0.25 1.30 1.40 1.50 0.33 0.41 0.51 0.19 - 0.25 0∘ - 8∘ 4.80 4.90 5.00 3.80 3.90 4.00 - 1.27 - 5.80 6.00 6.20 0.40 0.64 1. Ver1.0 Product Specification d L Detail c L1 See Detail Inch Min ...