BTN8962 datasheet(75/94 Pages) INFINEON

部品番号	BTN8962

部品情報	High Current PN Half Bridge

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5.7

Output duty cycle relationships

The output duty cycle do not have an exact linear relationship with the input duty cycle. The different PWM IN

to OUT transfer functions depend on the PWM frequency and the device specific timings. Rising time, falling

time and switch on/off delay times have to be taken into account for calculating the output duty cycle as shown

in Figure 80. The output duty cycle is mainly influenced by the switch on/off delay times. Especially for low

input PWM frequency , the rising/falling times have only minor impact on DCOUT.

As shown in Equation 39, the TON(OUT) is mainly influenced by switch on delay time, rising time and switch off

time:

TON(OUT) = DCOUT ⋅ T = DCIN ⋅ T + tdf HS − tr HS − tdr HS

Equation 39

The output duty cycle can be derived from the formula above:

DCOUT =

TON OUT

T

= DCIN + f ⋅ tdf HS − tr HS − tdr HS

Equation 40

Since DCOUT is mainly influenced by switch on/off delay times, the output duty cycle equation can be simplified

as:

DCOUT =

TON OUT

T

≈ DCIN + f ⋅ tdf HS − tdr HS

Equation 41

IN

VOUT

t

VOUT

tdr (HS ) tr(HS )

tdf (HS ) tf(HS )

VOUT

20%

80%

tr(HS ),total

tf(HS ),total

DCIN ·T

DCOUT ·T

Figure 80 Definition of duty cycle for load to GND

Since the switching on/off times are adjustable by varying the slew rate resistor, the output duty cycle spread is

mainly caused by the different RSR values. The output duty cycle spreads of BTN8982TA and BTN8962TA at a

PWM frequency of 20 kHz are shown in Figure 81 and Figure 82. The curves are fitted to the discrete

measurement data of (DCIN, DCOUT) points.

BTN8960 /62 /80 /82

High Current PN Half Bridge

Switching Timing

Application Note

75

Rev. 0.6

2017-02-21

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