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參數(shù)資料
| 型號： | TSM007IN |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 182K |
| 代理商： | TSM007IN |
Functional Description
TSM007
5/12
4
Functional Description
TSM007: PWM Controller IC
Internal UVLO function
The Under Voltage Lock Out function disables the
whole device when supply voltage is lower than
the threshold.
Vref block
The Vref block provides an internal 5V reference
voltage to the IC. An internal Vref status signal is
active when Vref is lower than 4.7V and is used to
drive the output driver low when Vref is not valid.
Startup latch
The startup latch is set when the IC exits from
standby mode or UVLO state. It is reset when the
CT capacitor is discharged for the first time.
Current sense input
A voltage proportional to the transformer primary
winding current is applied to the CS pin. The
control IC uses this information to perform current
mode control. The PWM function will be stopped if
the CS pin voltage is greater than 1.0V.
Oscillator
A capacitor from the CT pin to GND sets the
oscillating frequency.
T = Tc+Td
T = CT
Vct/Ici + CTVct/Icd
Let’s assume F = 1/T =100KHz
==> CT = (IcixIcd) / (Fx
Vct(Ici+Icd))
==> CT = 1.5nF
Vref
1mA
400A
CT
Comp_osc
1.4V_3.0V
Out
Vcc
UVLO
Vref
Vref_Status
R
S
Q
!Q
Startup Latch
Vref
1mA
400A
CT
Comp_osc
1.4V_3.0V
Out
R
S
Q
!Q
Cs Latch
1V
Comp_Cs
Comp
CS
2R
R
VF
725A
Vin
VCT
Tc
Td
Ici=400A
Vref
1mA
400A
CT
Ici
Vref
1mA
400A
CT
Icd
Icd=600A
3V
1.4V
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