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RT9971 Datasheet(PDF) 21 Page - Richtek Technology Corporation |
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RT9971 Datasheet(HTML) 21 Page - Richtek Technology Corporation |
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21 / 22 page  21 DS9971-01 April 2011 www.richtek.com RT9971 Table 5. Protection Items Protection type Threshold (typical) Refer to Electrical spec. Protection methods IC Shutdown Delay time Reset method VDDM OVP VDDM > 6.25V Automatic reset at VDDM < 6V 100ms VDDM power reset CH1 Step-Up Current Limit N-MOSFET current > 3A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset PVDD1 OVP PVDD1 > 6.25V N-MOSFET off, P-MOSFET off. No-delay VDDM power reset CH2 Step-Up Current Limit N-MOSFET current > 3A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset PVDD2 OVP PVDD2 > 6.25V N-MOSFET off, P-MOSFET off. No-delay VDDM power reset CH2 Step-Down Current Limit P-MOSFET current > 1.5A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset CH3 Step-Down Current Limit P-MOSFET current > 1.5A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset CH4 Step-Down Current Limit P-MOSFET current > 1.5A N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset CH5 Asyn Step-Up Current Limit N-MOSFET current > 1.2A N-MOSFET off. Automatic reset at next clock cycle 100ms VDDM power reset CH6 Inverting Current Limit P-MOSFET current > 1.5A P-MOSF ET off. Automatic reset at next clock cycle 100ms VDDM power reset CH7 WLED Current Limit N-MOSFET current > 0.8A N-MOSFET off. Automatic reset at next clock cycle Not Applicable Automatic reset at next clock cycle OVP VOUT7 > 14V Shutdown CH7 Not Applicable Reset by toggling EN7 SW 1 UVP VOUT1 < 1.75V after SW1 soft start end Automatic reset at VOUT1 > 1.75V 100ms VDDM power reset SW 5 OVP SW5I > 18V N-MOSFET off No-delay VDDM power reset UVP SW5O < 0.4V after SW5 soft start end Automatic reset at SW5O > 0.4V 100ms VDDM power reset Thermal Thermal shutdown Temperature > 160 °C All channels stop switching No-delay Temperature < 140 °C CH2 Step-Down UVP FB2 < 0.4V after CH2 soft start end N-MOSFET off, P-MOSFET off. Automatic reset at FB2 > 0.4V 100ms VDDM power reset CH3 Step-Down UVP FB3 < 0.4V after CH3 soft start end N-MOSFET off, P-MOSFET off. Automatic reset at FB3 > 0.4V 100ms VDDM power reset CH4 Step-Down UVP FB4 < 0.4V after CH4 soft start end N-MOSFET off, P-MOSFET off. Automatic reset at FB4 > 0.4V 100ms VDDM power reset CH5 UVP FB5 < 0.8V after CH5 soft start end N-MOSFET off. No-delay VDDM power reset CH6 UVP FB6 > 0.4V P-MOSF ET off. No-delay VDDM power reset |
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