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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC1304 датащи(PDF) 23 Page - Microchip Technology |
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TC1304 датащи(HTML) 23 Page - Microchip Technology |
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23 / 38 page  © 2008 Microchip Technology Inc. DS21949C-page 23 TC1303A/TC1303B/TC1303C/TC1304 4.6 TC1304 Sequencing The TC1304 device features an integrated sequencing option. A sequencing circuit using only the SHDN input, (Pin1), will turn on the LDO output (VOUT2) and delay the turn on of the Buck Regulator output (VOUT1) until the LDO output is in regulation. During power-down, the sequencing circuit will turn off the Buck Regulator output prior to turning off LDO output. FIGURE 4-2: TC1304 Sequencing Circuit. FIGURE 4-3: TC1304 Power-up Timing from SHDN. 4.7 Soft Start Both outputs of the TC1303/TC1304 are controlled during start-up. Less than 1% of VOUT1 or VOUT2 overshoot is observed during start-up from VIN rising above the UVLO voltage or either SHDN1 or SHDN2 being enabled. 4.8 Overtemperature Protection The TC1303/TC1304 has an integrated overtempera- ture protection circuit that monitors the device junction temperature and shuts the device off if the junction temperature exceeds the typical 165°C threshold. If the overtemperature threshold is reached, the soft start is reset so that, once the junction temperature cools to approximately 155°C, the device will automatically restart. Enable Enable VOUT2 VOUT1 + – + – 160 µs Delay* 160 µs Delay* 92% of VOUT2 92% of VOUT1 To PG Delay CKT. SHDN * 160 µs delay on trailing edge VIN1/VIN2 VOUT1 VOUT2 Power Good Power Up Timing From SHDN 300 ms tWK + tS 500 µs TC1304 SHDN |
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