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TD230 bảng dữ liệu(PDF) 8 Page - STMicroelectronics

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To avoid cumulative charging of the protection
capacitors CTRIP 1/2 in case of successive overcur-
rent conditions, the capacitors CTRIP 1/2 are con-
Figure 3 :
Fault Time Limitation
stantly discharged by another fixed current source
IP/N3 which value is a fourth of IP/N2 (1
µA).
Trace 1 represents the CBOOST Voltage (0 to
5+13,4 = 18,4V)
Trace 2 represents the CTRIP1 Voltage.
The value of the capacitors CTRIP 1/2 should be
chosen in relation with the required protection time
as indicated in equation (iv) :
• CTRIP1/2 =(IP/N2 - IP/N3)x tPROTECT1/2 /VSPN/3(iv)
where tPROTECT 1/2 is the time defined by the user
before a definitive resettable shutdown of MOS-
FET 1/2.
Equation (iv) can be translated to :
• CTRIP 1/2 =tPROTECT 1/2 x3µA / 1.20V (iv)
Note that the positive power supply disjonction
leads to the negative power supply disjonction,
whereas the opposite is not true.
2.3. Step-Up Converter
To ensure proper voltage on the gate of the positive
supply NMOS1 (VGS = 13.4V typ), the TD230 inte-
grates a step-up converter which is to be boosted
with two small low cost external components : an
inductor LBOOST and a capacitor CBOOST, as shown
in figure 4.
Rs e ns e
MOS
Lboos t
C boos t
Se ns e
Step Up
Driver
TD230
Figure 4 :
Step Up Converter External
Components
The principle of this inductive step-up converter is
to pump charges in the tank capacitor CBOOST
following the equation (v) :
Lboos t
Cboos t
TD230
Os c
Re gulation
Figure 5 :
Internal Step Up Schematic
• V(CBOOST)= VCC+ + 13.4V typ (v)
Charges are pumped by means of an oscillator
commanded switch, and stored in the CBOOST tank
capacitor through a diode as shown on figure 5.
Wh en th e vo lt a ge across CBOOST reaches
VCC
++13.4V typ, the oscillator is stopped. This
creates a ripple voltage with an amplitude of 0.2V.
Note that the min and max values of V(CBOOST)
comprised between VCC
+ +10V and VCC+ +15V
already take the ripple voltage into account.
TD230
8/15


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