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參數(shù)資料
| 型號(hào)： | TK75050D |
| 廠商： | TOKO INC |
| 元件分類： | MOSFETs |
| 英文描述： | SMART MOSFET DRIVER |
| 中文描述： | 1.5 A BUF OR INV BASED MOSFET DRIVER, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 131K |
| 代理商： | TK75050D |
January 1999 TOKO, Inc.
Page 7
TK75050
1.3 V. The hysteresis ensures that noise riding on the input
signal does not cause spurious response at the output.
POWER GROUND/CURRENT SENSE PIN (PGND/CS)
This pin has two distinct functions: 1) it provides a separate,
fully floating return path for the turnoff drive current of the
output stage and, thus, reduces the internal noise of the IC;
2) by connecting the pin to a current-sense resistor, the IC
acts as a fast cycle-by-cycle current limiter.
When the voltage between the power-ground pin (PGND/
CS) and the signal-ground pin (GND) exceeds the 0.95 V
current-limit threshold, the drive signal is terminated for
the remainder of the time while the input signal is high.
Once the input signal returned to zero, the latch that stored
the information about the presence of the overcurrent is
reset, and the IC is ready to acquire another overcurrent
event in the next cycle.
PIN DESCRIPTION
SUPPLY VOLTAGE PIN (V
CC
)
This pin is connected to the supply voltage. Regardless of
the state of the other pins, the IC is always in a low-current
standby mode when the supply voltage is below the lower
threshold of the undervoltage lockout circuit. The IC enters
normal mode when two conditions are met simultaneously:
1) the supply voltage exceeds the upper threshold of the
undervoltage lockout circuit, and 2) a "first" pulse arrives at
the input.
That first pulse "wakes up" the IC ( i.e., it enables the high-
speed internal circuitry). The First Pulse Wake-Up is a
proprietary feature of theTK75050. The feature is
proprietary, but use is granted for use with the IC. That
feature is indispensable in off-line self-biased power-
supply applications where the start-up current is provided
by a large-value resistor connected between the rectified
line and the IC (see Figure 1). Without the First Pulse
Wake-up, the starting current would be equal to the normal
supply current, which is prohibitively large for a self-biased
start.
GROUND PIN (GND)
This pin provides ground return connection for the small-
signal portion of the IC. The return of the output stage is not
connected here, but to the floating power GND pin.
OUTPUT PIN
This pin drives the external MOSFET using a totem pole
output stage. The peak drive source or sink current is
typically 2 A into a 10,000 pF equivalent load. The UVLO
circuity ensures that the high-level output voltage will
never be less than about 7 V. In standby mode, the output
stage is equivalent to a pull-down resistor of about 3 k
value, eliminating the need for an external gate to source
resistor. Normally, there is no need to add a Schottky diode
between the output and ground. In applications, however,
with heavy capacitive load located far from the IC or when
the IC drives a transformer, the Schottky diode may
become necessary.
INPUT PIN
The input pin receives the signal to be buffered. The
incoming signal is processed by a comparator with a
600 mV hysteresis centered around a threshold of about
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