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參數(shù)資料
| 型號： | TK75003 |
| 廠商： | TOKO Inc. |
| 英文描述： | PWM CONTROLLER |
| 中文描述： | 脈寬調(diào)制控制器 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 108K |
| 代理商： | TK75003 |
January 1999 TOKO, Inc.
Page 11
TK75003
t
OFF
= C
T
x 14 k
.
FIGURE 5: TK75003 IN A FORWARD CONVERTER
WITH CONSTANT OFF-TIME CURRENT-MODE
CONTROL
FIGURE 6: TIMING PIN AND FEEDBACK PIN
VOLTAGES WITH CONSTANT OFF-TIME CURRENT-
MODE CONTROL
TK75003 IN NON-ISOLATED APPLICATIONS
Although the IC was intended for off-line power-supply
applications with the voltage-error amplifier at the isolated
output, it is easy and economical to use the device in non-
isolated applications, too. Figure 7 shows a low-cost boost
power factor corrector controlled by the TK75003. Power
factor correction is achieved by controlling the boost
converter with constant-frequency peak-current control
and exploiting the variation of the allowed peak-current
level caused by the variable duty ratio and the stabilizing
ramp. Figure 8 shows a buck-boost converter with negative
input voltage and positive output voltage, controlled by the
TK75003. In both cases, the voltage-error amplifier is a
TL431 shunt regulator, and a PNP transistor provides
interface between the TL431 and the control IC.
FIGURE 7: TK75003 IN A LOW COST BOOST
POWER FACTOR CORRECTOR
FIGURE 8: NON-ISOLATED NEGATIVE-TO-POSITIVE
CONVERTER
APPLICATION INFORMATION (CONT.)
GND
VCC
CT
FB
DRV
Q1
VAUX
RS
TL431
+
VOUT
VIN
R1
VAUX
OC
CT
3.2 V
1.1 V
0
0.98 V
FEEDBACK VOLTAGE LEVEL
FB
CT
FB
CT
GND
VCC
CT
FB
DRV
TL431
VIN (-)
VOUT (+)
GND
VCC
CT
FB
DRV
TL431
VOUT
+
AC
IN
相關PDF資料 |
PDF描述 |
|---|---|
| TK75003D | PWM CONTROLLER |
| TK75003DIMG | PWM CONTROLLER |
| TK75005DCTL | LOW-COST FLEXIBLE PWM CONTROLLER |
| TK75005 | LOW-COST FLEXIBLE PWM CONTROLLER |
| TK75005DCMG | LOW-COST FLEXIBLE PWM CONTROLLER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TK75003D | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:PWM CONTROLLER |
| TK75003DIMG | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:PWM CONTROLLER |
| TK75003DIMG/75003 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:PWM CONTROLLER |
| TK75005 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW-COST FLEXIBLE PWM CONTROLLER |
| TK75005DCMG | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:LOW-COST FLEXIBLE PWM CONTROLLER |
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