C2472, C2473 and C2474
Datasheet
RDFC Controllers for Offline Applications
Product data
Page 14 of 18
DS-1423-0709C
© Cambridge Semiconductor Ltd 2007
26-Sep-2007
NORMAL OPERATING CONDITIONS
Parameter
Symbol
Condition
Min
Typ
Max
Units
Supply voltage
VDD
VDD pin, limited by internal regulator
3.1
3.3
3.5
V
Junction
temperature
TJ
Over temperature protection operates
at higher temperatures
-25
25
100
ºC
FCLK
Tj = 25 C, VDD=VDDREG(R)
9.7
12.1
14.5
MHz
Internal digital clock
frequency
FCLKTC
Temperature coefficient
-35
5
kHzC
-1
FMAX
FCLK / 61
MHz
Switching frequency,
Normal mode
FMIN
Determined by TRES (FCLK in MHz)
FCLK / 490
MHz
TRESMIN
35 / FCLK
µs
Transformer
resonance time
TRESMAX
Natural resonance of transformer and
associated capacitances. FCLK in MHz.
280 / FCLK
µs
Supply current
IDD
Limit externally
30
mA
ELECTRICAL CHARACTERISTICS
Unless otherwise stated:
1.
Min and Max electrical characteristics apply over normal operating conditions.
2.
Typical electrical characteristics apply at TJ = TJTYP and VDD = VDDTYP
3.
Functionality and performance is not defined when a device is subjected to conditions outside the
range of normal operating conditions and device reliability may be compromised.
4.
For parameters dependent on FCLK, the value of FCLK,in MHz should be used in calculations.
VDD Pin
Parameter
Symbol
Condition
Min
Typ
Max
Units
VDDREG(R)
Active state, 2.5 mA < IDD < 30 mA
3.1
3.3
3.5
V
Regulation voltage
VDDREG(S)
Start-up state, 2.5 mA < IDD < 30 mA
4
V
Quiescent current
IDDSLEEP
Sleep state, VDD < VUVDTHR
8
µA
Residual supply current
IDDWAKE
Start-up & Active states, Normal mode
(VDDREG(R) – 300 mV) < VDD and
VDD < (VDDREG(R) - 100 mV)
0.5
2.5
mA
OVD threshold, Sleep
VOVDTHR
Sleep state
3.5
4.6
V
UVD threshold
VUVDTHR
Start-up and Active states
2.7
3.2
V
VDDREG(R) - VUVDTHR
IDD < 30 mA
150
mV
AUX Pin
Parameter
Symbol
Condition
Min
Typ
Max
Units
Input current
IAUXMAX
100
mA
IAUX = 10 mA
0.84
1.22
V
AUX pin voltage
VAUXFON
BAS = 800 mV
0 C < TJ < 100 C
IAUX = 80mA
1.2
1.64
V
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