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參數(shù)資料
| 型號： | TK83854DTL |
| 廠商： | TOKO INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A POWER FACTOR CONTROLLER, 118 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 105K |
| 代理商： | TK83854DTL |
Page 8
April 2001 TOKO, Inc.
TK83854D
VOLTAGE AMPLIFIER INVERTING OUTPUT (V
SENSE)
This is normally connected to a feedback network and to
the boost converter output through a divider network.
OSCILLATOR CHARGING CURRENT AND MULTIPLIER
LIMIT SET (R
SET)
A resistor from R
SET to ground will program oscillator
charging current and maximum multiplier output. Multiplier
output current will not exceed 3.75 V divided by the resistor
from R
SET to ground.
SOFT-START (SS)
SS will remain at GND as long as the IC is disabled or V
CC
is too low. SS will pull up to over 8 V by an internal 14 A
current source when both V
CC becomes valid and the IC is
enabled. SS will act as the reference input to the voltage
amplifier if SS is below V
ref. With a large capacitor from SS
to GND, the reference to the voltage regulating amplifier
will rise slowly, and increase the PWM duty cycle slowly.
In the event of a disable command or a supply dropout, SS
will quickly discharge to ground and disable the PWM.
OSCILLATOR TIMING CAPACITOR (C
T )
A capacitor from C
T to GND will set the PWM oscillator
frequency according to this relationship:
f
OSC = 1.25 / (RSET x CT)
POSITIVE SUPPLY VOLTAGE (V
CC)
Connect V
CC to a stable source of at least 20 mA above 17
V for normal operation. Also bypass V
CC directly to GND to
absorb supply current spikes required to charge external
MOSFET gate capacitances. To prevent inadequate
GTDRV signals, these devices will be inhibited unless V
CC
exceeds the upper undervoltage lockout threshold and
remains above the lower threshold.
GATE DRIVER (GTDRV)
The output of the PWM is a totem pole MOSFET gate
driver on GTDRV. This output is internally clamped to
15 V so the IC can be operated with V
CC as high as 35 V.
Use a series gate resistor of at least 5 ohms to prevent
PIN DESCRIPTION (CONT.)
interaction between the gate impedance and the GTDRV
output driver that might cause the GTDRV output to
overshoot excessively. Some overshoot of the GTDRV
output is always expected when driving a capacitive load.
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