SG6846 ETC, SG6846 Datasheet
SG6846
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SG6846 Summary of contents
Page 1
... OCP function. Besides the cycle-by-cycle current limiting, if the switching current is higher than 2/3 of the peak-current threshold for a delay time, over-current protection will be activated such that the SG6846 will be totally shutdown. Other protection functions include: AC input brownout protection with hysteresis, and VDD over-voltage protection ...
Page 2
... SG6846LS 8-Pin SOP SG6846LD 8-Pin DIP SG6846CS 8-Pin SOP SG6846CD 8-Pin DIP SG6846LSZ 8-Pin SOP (Lead Free) SG6846LDZ 8-Pin DIP (Lead Free) SG6846CSZ 8-Pin SOP (Lead Free) SG6846CDZ 8-Pin DIP (Lead Free) © System General Corp. Version 1.0(IAO33.0008.B0) PIN CONFIGURATION OTP Latch ...
Page 3
... Detection this VIN signal suggested to add low pass filter to filter out line ripple on bulk capacitor. A resistor from the RI pin to ground will generate a reference current source inside SG6846. Reference This determines the switching frequency. Increasing the resistance will reduce the switching Setting frequency. Using a 26kΩ ...
Page 4
... VDD = 15V 8 GATE Open 3.7 22.6 23 26KΩ 100 o VDD = 5V TH(OFF) 1.25 Test Condition Min. Typ. 0.67 0.72 V IN-OFF 0.2 Test Condition Min. Typ. 1/4.2 4 5.5 6 SG6846 Unit °C/W °C °C °C Max. Unit 20 V 17 24.6 V usec Max. Unit 0. Max. ...
Page 5
... RI = 26KΩ Test Condition RI = 26kΩ 26kΩ 26kΩ VDD = 11.5V to 20V ℃ A Frequenc 85Hz/ 22.5kHz : 0kHz Product Specification SG6846 Min. Typ. Max. Unit 12 kΩ 100 200 nsec 360 nsec 0.83 V 0.70 V 0. msec Min. Typ. ...
Page 6
... VDD = 15V, CL=1nF 50 VDD = 20V 18 Test Condition Min. Typ 26kΩ 1.015 1.065 RI = 26kΩ 100 V OTP-LATCH- OFF Test Condition Min. Typ. 15.5 216 SG6846 Max. Unit nsec nsec V Max. Unit 76 uA 1.115 V usec V + 0.1 Max. Unit 36 kΩ kΩ ...
Page 7
... Temperature ( ℃ ) Start-up Current vs VDD Voltage VDD (V) PWM Turn-on Threshold Voltage vs Temperature 1.000 0.900 0.800 0.700 0.600 0.500 0.400 -40 -25 - Temperature ( ℃ ) www.sg.com.tw Sep. 30, 2004 SG6846 110 125 20 110 125 ...
Page 8
... PWM Frequency vs FB Voltage (RI = 26KΩ 1.5 1.6 1.7 1.8 1.9 2 2.1 V (V) FB 2/3 Current-limit Threshold vs VIN Voltage 1 0.8 0.6 0.4 0 1.5 2 2.5 V (V) IN OTP Threshold Voltage vs Temperature 1.115 1.095 1.075 1.055 1.035 1.015 -40 -25 - Temperature ( ℃ ) www.sg.com.tw Sep. 30, 2004 SG6846 2.2 2.3 3 110 125 ...
Page 9
... Oscillator Operation A resistor connected from the RI pin to GND generates a reference current source inside the SG6846. © System General Corp. Version 1.0(IAO33.0008.B0) This current is used to determine the PWM frequency. Increasing the resistance will decrease the amplitude of the current source and reduce the PWM frequency. Using a 26kΩ ...
Page 10
... When the voltage of the © System General Corp. Version 1.0(IAO33.0008.B0) Product Specification RT pin drops below 1.065V, the SG6846 will be turned off. There are two options for the protection modes, please see ORDER INFORMATION. Noise immunity Noise from the current sense or the control signal may cause significant pulse width jitter, particularly in continuous-conduction mode ...
Page 11
... P 50V D5 470u 25V F1 250V4A QUICK 220u 25V L1,L2 220u 50V L4 150u 400V U3 TL431 +/-1% 4u7 50V U1 10u 50V U2 Q1 TX1 100u 50V RT1 VZ1 1N4148 BYV95C SG6846 L1 32V 32V C12 C13 + + L2 16V 16V C14 C15 + + P32V P32V R20 VALUE DBL406G BYT28-300 BYV32-150 1.8uH ...
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... Product Specification Θ Inch Min. Typ. Max. 0.210 0.015 0.125 0.130 0.135 0.060 0.018 0.355 0.365 0.400 0.300 0.245 0.250 0.255 0.100 0.115 0.130 0.150 0.335 0.355 0.375 0 ˚ 7 ˚ 15 ˚ www.sg.com.tw SG6846 e B Sep. 30, 2004 ...
Page 13
... Product Specification C F Θ L Inch Min. Typ. Max. 0.053 0.069 0.004 0.010 0.016 0.008 0.183 0.196 0.150 0.157 0.050 ˚ 0.015X45 0.228 0.244 0.016 0.050 0 ˚ 8 ˚ www.sg.com.tw SG6846 Sep. 30, 2004 ...
Page 14
... RIGHT TO MAKE CHANGES System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering. © System General Corp. Version 1.0(IAO33.0008.B0) DISCLAIMERS - 14 - Product Specification SG6846 www.sg.com.tw Sep. 30, 2004 ...