Datasheet Texas Instruments TL3845BD — 数据表

TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
www.ti.com FEATURES Low Start-Up Current ( 5 kΩ:
f ≈ 1.72 / RTCT
VREF
RT
RT/CT
CT
GND Figure 3. Oscillator Section Submit Documentation Feedback 11 TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS www.ti.com SLVS610B – AUGUST 2006 – REVISED JULY 2007 APPLICATION INFORMATION (continued)
TIMING RESISTANCE
vs
FREQUENCY DEAD TIME
vs
TIMING CAPACITANCE
100 100 CT = 10 nF VCC = 15 V
RT ≥ 5 kΩ
TA = 25В°C 40 CT = 4.7 nF
CT = 2.2 nF R T -Timing Resistance -k Ω Dead Time -µ s 40 10
4 1 CT = 1 nF CT = 22 nF 10 CT = 47 nF
CT = 100 nF 4 0.4
VCC = 15 V
TA = 25В°C 1 …