AN2208 datasheet(5/51 Pages) STMICROELECTRONICS

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AN2208

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Figure 41.

Burst applied on the output channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 42.

Positive surge applied on power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 43.

Negative surge applied on power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 44.

Switching lamps: Vcc = 24V, f = 0.5Hz, Wave3 = VINOPT,

Wave2 = VOUT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 45.

Waveform tOFF inductor load: Vcc = 24V, L = 130mH, RLOAD = 60W,

tOFF = 1.2276ms, Wave2 = VOUT, Wave3 = VINOPT, Wave4 = ICH1OUT. . . . . . . . . . . 38

Figure 46.

Time delay between VINOPT and VOUT: Vcc = 24V, Load = Lamp,

Wave2 = VOUT, Wave3 = VINOPT, Dt = 139µs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 47.

Switching with short circuit: Vcc = 24V, f = 0.5Hz, Wave2 = VSTATUSOPT,

Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 48.

Waveform switching inductive load: Vcc = 24V, L = 130mH, RLOAD = 48W,

f = 0.5Hz, Wave2 = VOUT, Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . 39

Figure 49.

Switching with short circuit: Vcc = 24V, f = 0.5Hz, Wave2 = VSTATUSOPT,

Wave3 = VINOPT, Wave4 = ICH1OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 50.

Waveform ITOT and VSTATUSOPT during the test with short circuit:

Vcc = 28V, TA = 85°C, Wave4 = ITOT, Wave1 = VSTATUSOPT . . . . . . . . . . . . . . . . . . . 39

Figure 51.

Waveform on ITOT and VSTATUSOPT during the test with short circuit:

Vcc = 28V, TA = –25°C, Wave4 = ITOT, Wave1 = VSTATUSOPT . . . . . . . . . . . . . . . . . . 39

Figure 52.

VN808 RDB PCB layout (top and bottom) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 53.

VN808 RDB PCB layout (component side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 54.

VN340SP RDB PCB layout (Top side) and (Bottom side) . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 55.

VN340SP RDB PCB layout (component side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 56.

L5970D block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 57.

L5970 DC/DC converter layout example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 58.

Efficiency vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 59.

Output voltage stability of L5970D, Vss = 24 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 60.

Voltage ripple on capacitor C30, IOUTDC = 0.4A, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . 49

Figure 61.

Waveform on coil L1, IOUTDC = 0.4A, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 62.

Voltage ripple on capacitor C33, Vss = 24V, IOUTDC = 0.4 A . . . . . . . . . . . . . . . . . . . . . . 49

Figure 63.

Waveform on coil L1, without load, Vss = 24V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

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