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參數(shù)資料
| 型號： | TK75002D |
| 廠商： | TOKO INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | ERROR SIGNAL ISOLATOR |
| 中文描述： | SWITCHING REGULATOR, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 77K |
| 代理商： | TK75002D |
Page 8
January 1999 TOKO, Inc.
TK75002
TEST CIRCUIT EXAMPLE
This simple circuit shown in Figure 7 is designed to allow
the user to probe and observe the characteristic
performance and behavior of either a TK75001 or a
TK75003 operating with a TK75002. Also, either IC can be
characterized independently in the circuit. The TK75001/
TK75003 are pulse width modulated (PWM) controllers.
The TK75002 is a pulse-amplitude-modulated (PAM)
controller.
In all of the following text, the TK75003 can be substituted
for the TK75001, depending on which of those two ICs is
used in the characterization circuit. Ground is common to
both the TK75001 and the TK75002.
V
CC1
provides power to the TK75001. V
CC1
must be brought
up to around 15 V to turn on the TK75001. Turn-on can be
determined by any of the following events: a) current from
the V
CC1
supply jumps from ~ 1 mA to ~ 20 mA as the
supply voltage is raised, b) a timing waveform appears at
TP
5
, or c) a drive signal appears at TP
6
(assuming that TP
3
or TP
4
is held low). TP
5
is the timing pin of the TK75001,
which has a sawtooth voltage waveform across the 1000
pF timing capacitor. TP
4
is the feedback pin. The user can
force a voltage there directly (for example, to measure the
threshold voltage of the PWM, V
CCD
, which is approximately
0.92 V) or voltage can be applied at TP
3
. Applying the
voltage at TP
3
allows a voltage ramp to form and the PWM
characteristic to be observed. The modulation range from
zero to maximum PWM is approximately 0 to 1 V of voltage
applied to TP
3
. The higher the applied voltage, the narrower
the pulse width. Finally, in order to see the TK75001
operating with the TK75002, the voltage at TP
3
can be
applied by causing the TK75002 to operate, as described
next.
V
CC2
provides power to the TK75002. The TK75002 is
configured with a resistor-feedback limited DC gain from
V
CC2
so that a gradual PAM change can be easily observed
as V
CC2
is changed. The modulation range from zero to
maximum PAM is approximately 5 to 6 V of applied V
CC2
.
The higher the V
CC
the higher the PAM signal magnitude.
The PAM signal can be observed by probing TP
2
, although
it is more easily understood when connecting the probe
ground to V
CC2
since PAM is with respect to the supply
voltage in the TK75002. The peak-rectified transformer-
coupled output of the TK75002 can be observed at TP
3
.
APPLICATION INFORMATION (CONT.)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TK75002DIMG | ERROR SIGNAL ISOLATOR |
| TK75003 | PWM CONTROLLER |
| TK75003D | PWM CONTROLLER |
| TK75003DIMG | PWM CONTROLLER |
| TK75005DCTL | LOW-COST FLEXIBLE PWM CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK75002DIMG | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:ERROR SIGNAL ISOLATOR |
| TK75002DIMG/75002 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:ERROR SIGNAL ISOLATOR |
| TK75003 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:PWM CONTROLLER |
| 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 |
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