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參數(shù)資料
| 型號： | TK75050 |
| 廠商： | TOKO Inc. |
| 英文描述： | SMART MOSFET DRIVER |
| 中文描述： | 智能MOSFET驅(qū)動器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 131K |
| 代理商： | TK75050 |
Page 8
January 1999 TOKO, Inc.
TK75050
APPLICATION INFORMATION
START-UP
Figure 1 shows the application of the TK75050 smart
MOSFET driver in a self-biased power supply.
FIGURE 1: TK75050 IN A SELF-BIASED POWER
SUPPLY
Figure 2 shows the typical waveforms during start-up.
FIGURE 2: WAVEFORMS DURING START-UP
CYCLE-BY-CYCLE CURRENT LIMIT
Figure 3(a) shows how to use the TK75050 as a high-
speed cycle-by-cycle current limiter. Figure 3(b) shows the
waveforms. Note that the preferred connection for the
bottom terminal of the filter capacitor C
F
is to the PGND/CS
pin and not to the GND pin. By connecting C
F
to the PGND/
CS pin, the capacitive feedthrough of the drive signal that
would appear as a leading-edge spike in the current-sense
waveform is completely eliminated. This technique, called
"Gate Charge Recovery" is patented by Toko, Inc., but is
granted for use with the TK75050. For a detailed description
and application information of the Gate Charge Recovery
technique, see the Toko application note "Application
Considerations for a Smart Five-Pin MOSFET/IGBT Driver
with High-Speed Current-Limit Capability."
(a) (b)
FIGURE 3: CYCLE-BY-CYCLE CURRENT LIMIT WITH
THE TK75050
(a) SCHEMATIC (b) WAVEFORMS
MAIN OVERLOAD PROTECTION IN VOLTAGE-
MODE-CONTROLLED CONVERTERS
Figure 4 shows the TK75050 in a voltage-mode-controlled
flyback converter. In this application example, the IC
provides the main overload protection.
FIGURE 4: TK75050 IN A VOLTAGE-MODE-
CONTROLLED CONVERTER
+
+
CONPWM
VCC
VIN
TK75050
+
VOLTPWM
CONTROLLER
VIN
FEEDBACK
+12 V
VIN (t) & VOUT (t)
VIN (t)
VUVLO (t)
DRIVER “WAKES UP”
CONDITION
CUVLO
BOOTSTBEGINS
PWM ENABLE
UVLO LOWER THRESHOLD
UVLO UPPER THRESHOLD
VCC (t)
VAUX
RF
CF
VCC
OUT
IN
GND
PGND/CS
VCS (t)
+
-
RCS
0.95 V
CF IS CONNECTED TO GND
0.95 V
CF IS CONNECTED TO PGND/CS
IN
OUT
VCS(t)
VCS(t)
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