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LM3423Q0 Arkusz danych(PDF) 2 Page - Texas Instruments |
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LM3423Q0 Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 65 page VCC 1 EN VIN OVP RCT FLT DPOL DDRV HSP AGND COMP CSH DAP RPD 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nDIM TIMR LRDY PGND GATE HSN IS 21 VIN OVP RCT AGND COMP CSH nDIM VCC 1 EN DDRV HSP DAP RPD 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 PGND GATE HSN IS 17 OVP nDIM LM3421 AGND VIN PGND DDRV DAP GATE EN COMP VIN CSH RCT IS HSP RPD VCC HSN 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ILED PWM VIN (V) 100 95 90 85 80 10 15 20 25 30 LM3421, LM3421-Q1 LM3423, LM3423-Q1 SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011 www.ti.com Typical Boost Application Circuit Figure 1. Boost Evaluation Board 9 Series LEDs at 1A Connection Diagrams Top View Top View Figure 2. 16-Lead TSSOP Figure 3. 20-Lead TSSOP Package Number PWP Package Number PWP PIN DESCRIPTIONS LM3423 LM3421 Name Description Function Bypass with 100 nF capacitor to AGND as close to the device as 1 1 VIN Input Voltage possible in the circuit board layout. Connect to AGND for zero current shutdown or apply > 2.4V to 2 2 EN Enable enable device. 3 3 COMP Compensation Connect a capacitor to AGND to set the compensation. Connect a resistor to AGND to set the signal current. For analog 4 4 CSH Current Sense High dimming, connect a controlled current source or a potentiometer to AGND as detailed in the ANALOG DIMMING section. External RC network sets the predictive “off-time” and thus the 5 5 RCT Resistor Capacitor Timing switching frequency. Connect to PGND through the DAP copper pad to provide ground 6 6 AGND Analog Ground return for CSH, COMP, RCT, and TIMR. Connect to a resistor divider from VO to program output over-voltage 7 7 OVP Over-Voltage Protection lockout (OVLO). Turn-off threshold is 1.24V and hysteresis for turn-on is provided by 23 µA current source. 2 Submit Documentation Feedback Copyright © 2008–2011, Texas Instruments Incorporated Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1 |
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