Texas Instruments TPS92310-12 Evaluation Module TPS92310-12FB/NOPB TPS92310-12FB/NOPB Ficha De Dados
Códigos do produto
TPS92310-12FB/NOPB
V
CC
V
SW
V
ZCD
V
ZCD-ARM
V
ZCD-OVP
25.6V
13V
Startup
state
Low Freq state
Steady state
t
t
t
SNVS792 – FEBRUARY 2012
Startup Bias and UVLO
During startup, the TPS92310 is in the startup state. It is powered from the AC line through R
1
and D
1
(
).
In the startup state, most of the internal circuits of the TPS92310 shut down so that the quiescent current is
minimized. When V
minimized. When V
CC
(voltage on the VCC pin) reaches the rising threshold of the V
CC-UVLO
(typically 25.6V), the
TPS92310 is in the low frequency state, where t
ON
and t
OFF
are fixed to 1.5
μ
s and 72
μ
s. When V
ZCD–PEAK
is
higher than V
ZCD-ARM
, the TPS92310 enters normal operation.
Figure 16. Start up Bias Waveforms
Mode Decoder
The TPS92310 can operate in the Peak Current Mode (PCM) or Constant On-Time (COT) mode if an isolated
topology is used. The TPS92310 can also use a non-isolated topology. In this case, only the COT mode can be
selected. The COT mode gives a high power factor. The PCM can achieve a lower output current ripple. The
COT mode using a non-isolated topology can achieve a higher efficiency and good load regulation. The above
modes can be selected by setting the MODE1 and MODE2 pins according to Table 1. For normal operation of
the TPS92310, the MODE1 and MODE2 pins cannot be connect to ground at the same time. And these pin were
biased by an internal 1
topology is used. The TPS92310 can also use a non-isolated topology. In this case, only the COT mode can be
selected. The COT mode gives a high power factor. The PCM can achieve a lower output current ripple. The
COT mode using a non-isolated topology can achieve a higher efficiency and good load regulation. The above
modes can be selected by setting the MODE1 and MODE2 pins according to Table 1. For normal operation of
the TPS92310, the MODE1 and MODE2 pins cannot be connect to ground at the same time. And these pin were
biased by an internal 1
μ
A pull up, forcing any voltage into these pins are not allowed. The MODE decoder status
will latch-in only when V
CC
voltage reaches the V
CC-UVLO
turn on threshold during start-up.
Table 1. MODE Configuration
MODE1
MODE2
Mode of operation
OPEN
OPEN
COT mode using isolated topology
GND
OPEN
PCM using isolated topology
OPEN
GND
COT mode using non-isolated topology
GND
GND
Reserved
Copyright © 2012, Texas Instruments Incorporated
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