TDA4700 Datasheet, PDF (13/21 Pages) Siemens Semiconductor Group – Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS

TDA 4700
TDA 4718
Characteristics (cont’d)
V_S = 11 to 30 V; T_A = – 25 to 85 °C
Parameter
Symbol
Limit Values
min.
typ. max.
Unit Test
Condition
Oscillator (VCO)
Frequency range
Frequency change
Frequency change
Tolerance
Fall time sawtooth
RC combination
VCO
Ramp Generator
f_VCO
∆f/f_VCO
∆f/f_VCO
∆f/f_VCO
t
t
C_T
R_T
40
–1
–7
0.82
5
100 000 Hz
0.5
%
1
%
7
%
1
µs
10
µs
47
nF
700
kΩ
14 V ± 20 %
25 V ± 20 %
∆R_T = 0; ∆C_T = 0
C_T = 1 nF
C_T = 10 nF
Frequency range
Maximum voltage
at C_R
Minimum voltage
at C_R
Input current
through R_R
Current
transformation ratio
Synchronization
f
40
V_H
V_L
I_RR
0
I_RR/I_CR
100 000 Hz
5.5
V
1.8
V
400
µA
1/4
Sync output
Sync input
Input current
V_{Q H}
4
V_{Q L}
V_{I H}
2
V_{I L}
– I_I
V
I_{Q H} = – 200 µA
0.4
V
I_{Q L} = 1.6 mA
V
0.8
V
5
µA
Semiconductor Group
13