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CS5126XDR8 Datasheet(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS5126XDR8 Datasheet(HTML) 4 Page - Cherry Semiconductor Corporation |
4 / 10 page Package Lead Description PACKAGE LEAD # LEAD SYMBOL FUNCTION 4 Electrical Characteristics: -40°C ≤ TJ ≤ 125°C, -40°C ≤ TA ≤ 105°C, 7.60V ≤ VCC ≤ 20V, UVLO = 3.0V, ISENSE = 0V, CV(CC) = 0.33µF, CGATE = 1nF (ESR = 10Ω), CSS = 470pF CV(FB) = 100pF, unless otherwise stated. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 8 Lead SO Narrow CS5124 CS5126 11 VCC VCC Power Input Pin. 2 - BIAS VCC Clamp Output Pin. This pin will control the gate of an N-channel MOS- FET that in turn regulates VCC. This pin is internally clamped at 15V when the IC is in sleep mode. - 3 SYNC Clock Synchronization Pin. A positive edge will terminate the current PWM cycle. Ground this pin when it is not used. 3 2 UVLO Sleep and under voltage lockout pin. A voltage greater than 1.8V causes the chip to "wake up" however the GATE remains low. A voltage greater than 2.6V on this pin allows the output to switch. 4 4 SS Soft Start Capacitor Pin. A capacitor placed between SS and GROUND is charged with 10µA and discharged with 10mA. The Soft Start capacitor con- trols both soft-start time and hiccup mode frequency. 55 VFB Voltage Feedback Pin. The collector of an optocoupler is typically tied to this pin. This pin is pulled up internally by a 4.3kΩ resistor to 5V and is clamped internally at 2.9V(2.65V). If VFB is pulled > 4V, the oscillator is disabled and GATE will stay high. If the VFB pin is pulled < 0.49V, GATE will stay low. 66 ISENSE Current Sense Pin. This pin is connected to the current sense resistor on the primary side. If VFB is floating, the GATE will go low if ISENSE = 195mV (335mV). If ISENSE > 275mV (525mV), Soft Start will be initiated. 7 7 GATE Gate Drive Output Pin. Capable of driving a 3nF load. GATE is nominally clamped to 13.5V. 8 8 Gnd Ground Pin. s Voltage Feedback VFB Pull-up Res. 2.9 4.3 8.1 kΩ VFB Clamp Voltage CS5124 Only 2.63 2.90 3.15 V VFB Clamp Voltage CS5126 Only 2.40 2.65 2.90 V VFB Fault Voltage Threshold 460 490 520 mV s Output Gate Drive Maximum Sleep VCC = 6.0V, IOUT = 1mA 1.2 2.0 V Pull-down Voltage GATE High (AC) Series resistance < 1Ω (Note 1) VCC-1 VCC-0.5 V GATE Low (AC) Series resistance < 1Ω (Note 1) 0.0 0.5 V GATE High Clamp Voltage VCC = 20V 11.0 13.5 16.0 V Rise Time Measure GATE rise time, 45 65 ns 1V < GATE < 9V; VCC =12V Fall Time Measure GATE fall time, 25 55 ns 9V > GATE > 1V; VCC = 12V s Thermal Shutdown Thermal Shutdown Temperature (Note 1) (GATE low) 135 150 165 °C Thermal Enable Temperature (Note 1) (GATE switching) 100 125 150 °C Thermal Hysteresis (Note 1) 15 25 35 °C Notes 1. Not tested in production. Specification is guaranteed by design. |
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