TDA3606 Philips Semiconductors, TDA3606 Datasheet - Page 8

• Manufacturer Part Number: TDA3606
• Description: Multiple voltage regulator with battery detection
• Manufacturer: Philips Semiconductors

Philips Semiconductors
TEST AND APPLICATION INFORMATION
Test information
Application information
N
The noise at the output of the regulator depends on the
bandwidth of the regulator, which can be adjusted by
means of the output capacitor. In Table 1 the noise figures
are given.
Table 1 Noise figures
Note
1. Measured at a bandwidth of 10 Hz to 100 kHz.
The noise on the supply line depends on the value of the
supply capacitor and is caused by a current noise (output
noise of the regulator is translated into a current noise by
means of the output capacitor). When a high frequency
capacitor of 220 nF in parallel with an electrolytic capacitor
1998 Jun 16
handbook, full pagewidth
OISE
CURRENT
Multiple voltage regulator with battery
detection
OUTPUT
(1) Capacitor not required for stability.
I
O
0.5
(mA)
50
V I(bat)
V P
AT OUTPUT CAPACITOR C
250
10
58
10 F
10 F
NOISE FIGURE ( V)
(1)
battery input voltage
200
47
50
V P
V C
8
3
1
(1)
L
100
180
45
TDA3606
( F)
Fig.5 Test circuit.
GND
4
8
of 100 F is connected directly to pins 8 and 4 (supply and
ground) the noise is minimized.
S
The regulator is stabilized by means of the output
capacitor. The value of the output capacitor can be
selected using the diagram shown in Fig.6. The following
two examples show the effects of the stabilization circuit
using different values for the output capacitor.
Example 1
The regulator is stabilized using an electrolytic output
capacitor of 68 F (ESR = 0.5 ). At 40 C the capacitor
value is decreased to 22 F and the ESR is increased to
3.5 . The regulator will remain stable at a temperature of
Example 2
The regulator is stabilized using an electrolytic output
capacitor of 10 F (ESR = 3.3 ). At 40 C the capacitor
value is decreased to 3 F and the ESR is increased to
23.1 . The regulator will be instable at a temperature of
10 F.
40 C.
40 C. This can be solved using a tantalum capacitor of
7
6
5
2
TABILITY
battery output voltage
regulator output
reset 1 output
reset 2 output
10 F
MGB808
R L(REG)
R L(RES1)
R L(RES2)
R L(bat)
1 k .. 0.5
1 k
1 k
1 k
Product specification
TDA3606