NE5562D Philipss, NE5562D Datasheet - Page 23

• Manufacturer Part Number: NE5562D
• Description: Switched-mode power supply control circuit
• Manufacturer: Philipss

Philips Semiconductors
Solving for the temperature rise from ambient to the IC functions:
Temperature rise = 61 C/W 0.33W
1994 Aug 31
P
Switched-mode power supply control circuit
D
NOTES:
1. Supply will become active as point ‘A’ reaches the level of V
2. Monitor Pin 19 and Pin 2 on dual-trace scope with voltmeter connected to supply output.
=330mW
= (22 10
-3
) (15)
= 20.1 C
1 F
(0.472) V
CURRENT
SOURCE
VOLTAGE
SOURCE
VARIABLE
SUPPLY
Z
0-5V
V
Z
‘A’
10k
V
V
10k
S
I
4
5
3
2
8
17
7
REF
Figure 39. Internal Voltage Regulator
Q
R
12
Figure 40. Open-Loop Test Setup
10k
ERROR
, 3.80V.
NE5562
V
AMP
+12–15V
REF
10k
17
20k
10
10k
30k
19
14
15
20
6
23
REGULATOR
100pF
1k
Junction temperatures will be 20.1 C above average ambient
temperatures which is 40 C
The allowable maximum junction temperature is 150 C 125 C is
more conservative. The conditions of this example are safe.
T
J
790
=40 C 20.1 C 60.1 C
+25V
IRF530
R
SH
3.80V
V
FROM BIASING
NETWORK
S
C
L
O
O
C
L
NE/SE5562
Product specification
SL00426
SL00427