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TPS92010DR Datasheet(Folha de dados) 13 Page - Texas Instruments

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Nome de Peças. TPS92010DR
descrição  8-PIN HIGH-EFFICIENCY, OFFLINE LED LIGHTING CONTROLLER
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Fbricantes  TI [Texas Instruments]
Página de início  http://www.ti.com
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S
Q
Q
R
REF
D
Q
Q
CLR
SET
Power-Up Reset
Thermal
Shutdown
+
+
1.25 V
0.6 V/0.7 V
+
SS/DIS
RUN
3
PCS
OVR_T
LINE_VSD
(QR Detect)
LOAD_VSD
(QR Detect)
UVLO
REF_OK
Low
Power
20 kW
REF
(5 V)
FB
7
FB
PCS
SS_OVR
0.6 V/1.5 V
LPM
8
TPS92010
Low
Power
UDG-09224
TPS92010
www.ti.com
SLUSA14 – DECEMBER 2009
Figure 7. Fault Logic Details
Quasi-Resonant / DCM Control
Quasi-resonant (QR) and DCM operation occur for feedback voltages VFB between 2.0 V and 4.0 V. In turn, the
peak PCS voltage is commanded to be between 0.4 V and 0.8 V. During this control mode, the rising edge of GD
always occurs at the valley of the resonant ring after demagnetization. Resonant valley switching is an integral
part of QR operation. Resonant valley switching is also imposed if the system operates at the maximum
switching frequency clamp. In other words, the frequency varies in DCM operation in order to have the switching
event occur on the first resonant valley that occurs after a 7.7-
μs (130-kHz) interval. Notice that the PCS pin has
an internal dependent current source, ½ ILINE. This current source is part of the cycle-by-cycle power limit
function that is discussed in the Protection Features section.
Frequency Foldback Mode Control
Frequency foldback mode uses elements of the FAULT LOGIC, shown in Figure 7 and the mode clamp circuit,
shown in Figure 5. At the minimum operating frequency, the internal oscillator sawtooth waveform has a peak of
4.0 V and a valley of 0.1 V. When the FB voltage is between 2.0 V and 1.4 V, the FB_CL signal in Figure 5
commands the oscillator in a voltage controlled oscillator (VCO) mode by clamping the peak oscillator voltage.
The additional clamps in the OSCILLATOR restrict VCO operation between 40 kHz and 130 kHz. The FB_CL
voltage is reflected to the modulator comparator effectively clamping the reflected PCS command to 0.4 V.
Copyright © 2009, Texas Instruments Incorporated
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