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參數(shù)資料
| 型號： | NCP1523 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| 中文描述： | 6甲，2.2 V至5.5 V輸入，非隔離，寬輸出，可調(diào)電源模塊的TurboTrans |
| 文件頁數(shù)： | 28/35頁 |
| 文件大?。?/td> | 1128K |
| 代理商： | NCP1523 |
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T Time 20 ms/div
V
TRK
(1 V/div)
V
01
(1 V/div)
V
02
(1 V/div)
T Time 200
μ
s/div
V
TRK
(1 V/div)
V
01
(1 V/div)
V
02
(1 V/div)
Prebias Startup Capability
A prebias startup condition occurs as a result of an external voltage being present at the output of a power
module prior to its output becoming active. This often occurs in complex digital systems when current from
another power source is backfed through a dual-supply logic component, such as an FPGA or ASIC. Another
path might be via clamp diodes as part of a dual-supply power-up sequencing arrangement. A prebias can
cause problems with power modules that incorporate synchronous rectifiers. This is because under most
operating conditions, these types of modules can sink as well as source output current.
The PTH family of power modules incorporate synchronous rectifiers, but does not sink current during startup
(1)
,
or whenever the Inhibit pin is held low. However, to ensure satisfactory operation of this function, certain
conditions must be maintained
(2)
.
Figure 27
shows an application demonstrating the prebias startup capability.
The startup waveforms are shown in
Figure 28
. Note that the output current (I
O
) is negligible until the output
voltage rises above the voltage backfed through the intrinsic diodes.
PTH04T230W, PTH04T231W
SLTS271A–SEPTEMBER 2006–REVISED OCTOBER 2006
Figure 25. Simultaneous Power Up With Auto-Track
Control
Figure 26. Simultaneous Power Down With Auto-Track
Control
The prebias start-up feature is not compatible with Auto-Track. When the module is under Auto-Track control, it
sinks current if the output voltage is below that of a back-feeding source. To ensure a pre-bias hold-off one of
two approaches must be followed when input power is applied to the module. The Auto-Track function must
either be disabled
(3)
, or the module’s output held off (for at least 50 ms) using the Inhibit pin. Either approach
ensures that the Track pin voltage is above the set-point voltage at start up.
1. Startup includes the short delay (approximately 10 ms) prior to the output voltage rising, followed by the rise
of the output voltage under the module’s internal soft-start control. Startup is complete when the output
voltage has risen to either the set-point voltage or the voltage at the Track pin, whichever is lowest.
2. To ensure that the regulator does not sink current when power is first applied (even with a ground signal
applied to the Inhibit control pin), the input voltage must always be greater than the output voltage
throughout
the power-up and power-down sequence.
3. The Auto-Track function can be disabled at power up by immediately applying a voltage to the module’s
Track pin that is greater than its set-point voltage. This can be easily accomplished by connecting the Track
pin to V
I
.
28
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