CS51021 Cherry Semiconductor Corporation, CS51021 Datasheet
CS51021
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CS51021 Summary of contents
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... The CS51021 and CS51023 feature bidirectional synchronization capa- bility, while the CS51022 and CS51024 offer a sleep mode with 100µA maximum IC current con- sumption ...
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... Lead Temperature Soldering: Reflow (SMD styles only).............................................60 sec. max above 183°C, 230°C peak Electrical Characteristics: Unless otherwise stated, specifications apply for -40°C < < V PARAMETER Under Voltage Lockout START Threshold (CS51021/22) START Threshold (CS51023/24) STOP Threshold Hysteresis (CS51021/22) Hysteresis (CS51023/24 Startup (CS51021/22 Startup (CS51023/24 Operating (CS51021/23 Operating (CS51022/24) CC ...
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... Temperature Stability Min Charge & Discharge Time Duty Cycle Accuracy Peak Voltage Valley Voltage Valley Clamp Voltage Discharge Current Discharge Current Synchronization (CS51021/23) Input Threshold Output Pulsewidth Output High Voltage Input Resistance Drive Delay Output Drive Current SLEEP (CS51022/24) SLEEP Input Threshold ...
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... Charge Current Discharge Current Charge Voltage Discharge Voltage Note 1: Guaranteed by Design, not 100% tested in production. PACKAGE PIN # 16L PDIP & SO Narrow 1 GATE 2 I SENSE 3 SYNC (CS51021/23) 3 SLEEP (CS51022/24) 4 SLOPE < 20V, 8.2V < V < 20V TEST CONDITIONS SLOPE = 2V ...
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... SENSE 0 SET V REF 12.5µA OV Figure 1: CS51021/22/23/24 Block Diagram Package Pin Description: continued C Timing resistor and maximum duty cycle, D Voltage at this pin sets pulse-by-pulse overcurrent threshold, and second threshold (1.33 times higher) with Soft Start retrigger (hic- cup mode). ...
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... CC portion of the IC. The internal logic monitors the supply voltage During abnormal operating conditions, the CC output is held low. The CS51021/22/23/24 requires only 75µA of startup current. Voltage Feedback The output voltage is monitored via the V compared with the internal 2.5V reference. The error amplifier output minus one diode drop is divided by 3 and connected to the negative input of the PWM compara- tor ...
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PWM comparator is a combination of these two voltages. The slope compensation, lated using the following formula: dV 53µA SLOPE = 0.1 × should be noted that internal capacitance of the IC will ...
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It is determined by the ratio between the timing resistor R T tor C . Refer to figures 5 and 6 to select appropriate values T ...
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... Max 16L SO Narrow 10.00 1.27 (.050) 0.40 (.016) REF: JEDEC MS-012 Ordering Information Part Number Description CS51021ED16 16L SO Narrow CS51021EDR16 16L SO Narrow (tape & reel) CS51022ED16 16L SO Narrow CS51022EDR16 16L SO Narrow (tape & reel) CS51023ED16 16L SO Narrow CS51023EDR16 16L SO Narrow (tape & reel) CS51024ED16 ...