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参数资料
| 型号： | TSM007IN |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 9/12页 |
| 文件大小： | 182K |
| 代理商： | TSM007IN |
TSM007
Functional Description
6/12
Soft start
A capacitor from the SS pin to GND provides the
soft start function. The capacitor starts to charge
when VIN reaches the UVLO threshold and Vref is
good.The soft start block enables the IC to start
with a progessive PWM duty cycle. The soft start
period is set by the external capacitor Css. The
soft start comparator drives the output driver low
when the SS pin voltage is greater than the CT pin
voltage minus one VF voltage..
Tss = Cssx(Vthct-VF)/Iiss
Let’s assume Tss = 50ms
==> Css = TssxIiss/(Vthct-VF)
==> Css = 210nF
Brown out
A voltage proportionnal to the Bulk capacitor
voltage is applied to the BRNOUT pin. When this
pin signal is less than 2.5V, the IC is disabled: SS
and CT pins go low, Vref is disabled and the IC
goes to standby mode. All bias currents are
switched off. The 2.5V voltage at the negative
input of comparator Comp_Brown out is still
active. When Brown out voltage goes higher than
2.5V, Vref is enabled again. A startup period is
started, and then a soft start occurs..
Let’s assume BRNOUT acts for Vfiltered = 200V
R2 = 15K
R1 = R2(Vfiltered - UVLO) / UVLO
When BRNOUT is bellow 2.5V
IR2 = Vfiltered(R1+R2)
When BRNOUT is above 2.5V
IR2 = Ibr + Vfiltered(R1+R2)
BRNOUT = R2x(Ibr + Vfiltered(R1+R2))
R1 = 1185K
R2 = 167A
When BRNOUT is above 2.5V
IR2 = 237A
BRNOUT = 3.55V
Vref
Idss
4mA
Iiss
10A
Css
SS
Comp_SS
VF
CT
Comp_osc
1.4V_3.0V
Out
R
S
Q
!Q
Cs_latch
SS
VCT-VF
Tss = Soft start period
Out
2.4V
0.8V
Iiss=10A
Iiss
Vref
1mA
400A
CT
Comp_osc
1.4V_3.0V
Out
Vcc
UVLO
Vref
Vref_Status
R
S
Q
!Q
Startup Latch
Comp_brown out
Ibr = 50A
Vin
2.50V
Brown out
R1
R2
filtered
Ibr
Brown out
2.5V
Ibr=50A
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