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STR5A162D bảng dữ liệu(PDF) 8 Page - Sanken electric |
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STR5A162D bảng dữ liệu(HTML) 8 Page - Sanken electric |
8 / 21 page STR5A100D Series STR5A100D-DS Rev.1.3 SANKEN ELECTRIC CO.,LTD. 8 Aug. 08, 2014 10. Operational Description All of the parameter values used in these descriptions are typical values, unless they are specified as minimum or maximum. With regard to current direction, "+" indicates sink current (toward the IC) and "–" indicates source current (from the IC). 10.1 Startup Operation Figure 10-1 shows the VCC pin peripheral circuit. The IC incorporates the startup circuit. The circuit is connected to D/ST pin. When D/ST pin voltage reaches to Startup Circuit Operation Voltage VSTARTUP = 29 V, the startup circuit starts operation. During the startup process, the constant current, ISTARTUP = − 2.1 mA, charges C4 at VCC pin. When VCC pin voltage increases to VCC(ON) = 15.0 V, the control circuit starts switching operation. After switching operation begins, the startup circuit turns off automatically so that its current consumption becomes zero. The approximate startup time of IC, tSTART, is calculated as follows: STARTUP ) INT ( CC ) ON ( CC START I V V 4 C t - (1) where, tSTART: Startup time of IC in second VCC(INT) : Initial voltage on VCC pin in V VAC C2 D2 R6 C4 T1 D P VCC S/GND D/ST 4 5,6,7 2 U1 VD C1 L1 FB 1 R3 R4 R5 Figure 10-1 VCC pin peripheral circuit 10.2 Undervoltage Lockout (UVLO) Figure 10-2 shows the relationship of VCC pin voltage and circuit current ICC. When VCC pin voltage increases to VCC(ON) = 15.0 V, the control circuit starts switching operation and the circuit current ICC increases. When VCC pin voltage decreases to VCC(OFF) = 8.1 V, the control circuit stops operation by UVLO (Undervoltage Lockout) circuit, and reverts to the state before startup. Circuit current, ICC ICC(ON) VCC(OFF) VCC(ON) VCC pin voltage Start Stop Figure 10-2 Relationship between VCC pin voltage and ICC 10.3 Auxiliary Winding Figure 10-3 shows VCC voltage behavior during the startup period. When VCC pin voltage increases to VCC(ON) = 15.0 V at startup, the IC starts the operation. Then circuit current increases and VCC pin voltage decreases. Since the Operation Stop Voltage VCC(OFF) = 8.1 V is low, the auxiliary winding voltage reaches to setting value before VCC pin voltage decreases to VCC(OFF). Thus control circuit continues the operation. The voltage from the auxiliary winding D in Figure 10-1 becomes a power source to the control circuit in operation. The approximate value of auxiliary winding voltage is about 12 V to 16 V, taking account of the winding turns of D winding so that VCC pin voltage satisfies Equation (2) within the specification of input and output voltage variation of power supply. IC starts operation VCC pin voltage VCC(ON) VCC(OFF) Startup failure Startup success Target operating voltage Time Increase with rising of output voltage Figure 10-3 VCC pin voltage during startup period |
Số phần tương tự - STR5A162D |
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Mô tả tương tự - STR5A162D |
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