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参数资料
| 型号： | TPS43000PWRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, TSSOP-16 |
| 文件页数： | 4/31页 |
| 文件大小： | 615K |
| 代理商： | TPS43000PWRG4 |
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TPS43000
SLUS489 OCTOBER 2001
12
www.ti.com
APPLICATION INFORMATION
synchronization and shutdown
The TPS43000 incorporates a dual function synchronization and shutdown pin. It may be used to synchronize
the TPS43000’s switching frequency to an external clock, or to shutdown the device entirely.
To synchronize the internal clock to an external source, the SYNC/SD pin must be driven high, greater than
1.6 V. The circuitry synchronizes to the rising edge of the input. Duty cycle is not critical, but the pulse width must
be at least 100 ns wide but less than 10
s to avoid shutdown. The external SYNC clock should be between
10% and 25% above the free-running switching frequency.
To ensure a shutdown of the converter, the SYNC/SD pin must be held high (above 1.6 V) for a minimum of
35
s. In shutdown, both the energizing and rectifier MOSFETs are turned off. The quiescent current is reduced
to less than 10
A with 1.6 V applied to SYNC/SD and less than 2 A with VIN potential applied to SYNC/SD.
Bringing this pin low again allows the device to resume operation, starting with a full soft-start cycle.
overcurrent protection
The TPS43000 allows the user to select either pulse-by-pulse current limiting or hiccup mode overcurrent
protection using the CCS pin. To minimize external part count and minimize losses, the energizing MOSFET’s
RDS(on) is used as the current sense element. The TPS43000 incorporates a high-speed comparator, referred
to as the IMAX comparator, that senses the voltage across the energizing MOSFET using the SWN input ,which
is connected to the energizing MOSFET’s drain through a 1-k
resistor. The IMAX comparator compares its
SWN input to either ground (boost, flyback, and SEPIC topologies) or VIN (buck topology). Before the IMAX
comparator is enabled, the energizing MOSFET must be fully enhanced, and the drain-to-source voltage must
be allowed to settle. The TPS43000 has an internal circuit that enables the IMAX comparator approximately
60 ns after the energizing MOSFET is enhanced.
pulse-by-pulse current limiting constant current source mode (CCS tied to VIN)
In the pulse-by-pulse current limiting mode, the energizing MOSFET gate drive is terminated once the
overcurrent threshold is reached. An overcurrent, IMAX, is sensed when the voltage drop across the energizing
MOSFET reaches 150 mV. The pulse-by-pulse current limiting threshold is defined by the equation:
I
MAX(pp) +
150 mV
R
DS(on)
In the boost, flyback, and SEPIC topologies, IMAX(pp) is reached when the voltage on the SWN pin is 150 mV
above ground. In the buck topology, IMAX(pp) is reached when the voltage on the SWN pin is 150 mV below
VIN. For this reason, it is important to have the VIN pin well decoupled. Pulse-by-pulse current limiting is enabled
by connecting the CCS input pin to VIN.
hiccup mode over current protection (CCS tied to ground)
In the hiccup mode overcurrent protection scheme, an internal digital counter is used to count the number of
IMAX pulses at the output of the IMAX comparator. An IMAX condition is sensed when the voltage drop across
the energizing MOSFET reaches 250 mV. The hiccup mode overcurrent threshold is defined by the equation:
I
MAX(hu) +
250 mV
R
DS(on)
In the boost, flyback, and SEPIC topologies, IMAX(hu) condition is reached when the voltage on the SWN pin is
250 mV above ground. In the buck topology, IMAX(hu) condition is reached when the voltage on the SWN pin
is 250 mV below VIN. When 63 IMAX(hu) pulses are reached, both the energizing MOSFET and rectifier MOSFET
are turned off. The MOSFET switches are held off for 882 clock cycles before a soft-start is initiated. Hiccup
mode overcurrent protection is enabled by connecting the CCS input pin to ground.
(3)
(4)
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