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AN2846 датащи(PDF) 13 Page - STMicroelectronics

номер детали AN2846
подробное описание детали  The serial current limited termination device
PDF  35 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2846 датащи(HTML) 13 Page - STMicroelectronics

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AN2846
Application guidelines
Doc ID 15130 Rev 1
13/35
Figure 17.
Regulator output voltage
Figure 18 shows the schematic diagram of a solution for applications where greater current
is needed. The bypass transistor allows extra current while maintaining a 5 V regulated
voltage (see Figure 19).
The proposed circuit allows a 25 mA current load capability with a VDD regulation <2%. An
additional input protection device, like SMAJ30A, is needed to comply with voltage surges
because RC has to be reduced to limit the voltage drop across it.
The dissipated power in the bypass transistor PZT2N2907A is 550 mW.
Components used:
●
PZT2N2907A (SOT223 with 1 cm2 copper area)
●
RC = 330 Ω (1/8 W), RE = 51 Ω (1/8 W)
1.4
SPI functional description
Three registers (refer to Figure 1) are used to transfer input data and control data to the
16-bit data frame. The data frames are transmitted through four interface signals: /CS, SCK,
MOSI, and MISO.
4.5
4.6
4.7
4.8
4.9
5.0
5.1
V
-3%
dd
9.0
V
(V)
dd
I
(mA)
dd
V
versus I
dd
dd
Figure 18.
VDD booster schematic
Figure 19.
Load regulation with VDD booster
R
E
R
C
V
CC
2N2907A
IDD
V
VDD
IRC
SMAJ30A
SCLT3
IN1
IN2
IN3
IN4
VC
VDD
LED2
LED3
LED1
RREF
VCS
0.00
5.00
10.00
15.00
20.00
25.00
4.800
4.850
4.900
4.950
5.000
5.050
5.100
0.00
5.00
10.00
15.00
20.00
25.00
I
(mA)
DD
V
(V)
DD
V
DD



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