SI9124 Datasheet, PDF (12/16 Pages) Vishay Siliconix – 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control

Si9124
Vishay Siliconix
New Product
TYPICAL CHARACTERISTICS
F_OSC vs. R_OSC @ V_CC = 12 V
600
500
400
300
200
20
30
40
50
60
70
80
R_OSC (kW)
I_HCUP vs. SS Duty Cycle, C_SS 22 = nF
14
13
12
11
10
9
8
V_CC = 12 V
V_iINDET = 4.8 V
7
OUT_A = OUT_B = 3 nF
C_{SEC_SYNC} = 0.3 nF
6
10
20
30
40
50
SS Duty Cycle (%) = t₂ / (t₁ + t₂)
OUT_A, OUT_B Delay vs. Temperture
120
V_CC = 12 V
100
t_d1, t_d3
t_d2, t_d4
80
60
40
- 50 - 25
0
25 50 75
Temperature (_C)
100 125
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12
3.300
V_REF vs. Temperature, V_CC = 12 V
3.295
3.290
3.285
3.280
3.275
3.270
- 50 - 25
0
25
50
Temperature (_C)
75
100
OUT_A, OUT_B Duty Cycle vs. V_EP
100
90
3.6 V = V_INDET
80
70
60
7.2 V
4.8 V
50
40
V_CC = 12 V
30
20
10
0
0.0
0.5
1.0
1.5
2.0
V_EP (V)
Duty Cycle vs. V_INDET @ 25_C
V_EP = 1.2 V, V_CC = 9.5 V
100
90
80
70
60
50
OUT_A, OUT_B
40
30
2.5
3.5
4.5
5.5
6.5
7.5
V_INDET (V)
Document Number: 72099
S-03638—Rev. B, 20-Mar-03