SID1102K datasheet(4/20 Pages) POWERINT

4 / 20 page

Rev. E 09/19

SID1102K

www.power.com

Application Example and Components Selection

Without Booster

Figure 5 and Figure 7 show the primary-side and secondary-side

schematic and typical components used for SID1102K design without

a booster stage, in which the primary-side supply voltage (V

VCC) will

be connected between VCC and GND pins and supported through

supply bypass ceramic capacitors C

1 (4.7 µF typically) and C2 (470 nF

typically). If the command signal voltage level is higher than the

rated IN pin voltage, a resistive voltage divider should be used

(Figure 6). Additional capacitor C

F can be used to provide input signal

filtering as shown in Figure 8. The filter time

τ can be calculated

according to equation (1):

(1)

The secondary-side isolated power supply (V

TOT) is connected

between VISO and COM. The positive voltage rail (V

VISO) is supported

through ceramic capacitor C

S1. The negative voltage rail (VVEE) is simi-

larly supported through capacitor C

S2. Typically, CS1 and CS2 should be

at least 3 µF multiplied by the total gate charge of the power

semiconductor switch (Q

GATE) divided by 1 µC. A 10 nF capacitor CGXX

is connected between the G and VGXX pins.

To ensure gate voltage stabilization and collector current limitation

during short-circuit the gate is connected to V

VISO through Schottky

diode D

STO.

To avoid parasitic power-switch-conduction during system power-on

the gate is connected to COM through 22 kΩ resistor R

3 as shown in

Figure 7.

Gate resistors are located physically close to the power semiconduc-

tor switch. As these components can get hot, it is recommended that

they are placed away from the SCALE-iDriver.

Application Example and Components Selection

With Booster

The primary-side can be setup identical as described in the previous

section refering to Figure 5 or Figure 6 or Figure 8.

The secondary-side is slightly extended by the booster MOSFETs T

and T

2 (BSO220N03MD G for example) and the addition of discrete

gate resistors R

GON and RGOFF as well as diode D2 (PMEG4010CEJ for

example). All other components can be kept, values might be

adapted to the relevant target power semiconductor switching device,

such as gate resistors and the supply bypass capacitors C

S1, CS2.

In Off-state (VIN = 0 V) the AUXGL pin provides a positive voltage to

the gate terminal of T

2 with reference to the MOSFETs source

potential e.g. COM. T

2 conducts the semiconductors gate terminal to

COM via R

GOFF, providing a negative voltage with reference to VEE to

the semiconductors gate (IGBT in this case). The power semiconduc-

tor device is off.

When VIN changes from 0 V to 5 V, T

2 is turned off by applying 0 V

to the AUXGL pin with reference to COM. At the same time T

1 is

turned on by providing a positive gate voltage via AUXGH to the gate

of T

1 with reference to G. Since the G pin is connected to VTOT in

On-state, the potential of the AUXGH pin needs to be higher than

TOT. This is achieved via SCALE-iDriver’s internal charge pump /

bootstrap. When T

1 conducts, it provides a positive gate voltage to

the power semiconductors gate with reference to VEE. The power

semiconductor device is on.

When VIN changes from 5 V to 0 V, it has to be considered, that R

GON

and R

GOFF are paralleled, consequently resulting in a RGOFF < RGON for all

chosen. R

G is placed in series to RGON to allow RGOFF > RGON.

To ensure that no parasitic turn-on of the power semiconductor

switching device occurs when used on the high-side of a half-bridge

topology and under worst case switching conditions, the use of the

Schottky diode D

2 (PMEG4010CEJ for example) is recommended.

Since the current capability of the VGXX pin is limited, it is recom-

mended to restrict the applicable external N-Channel Booster

MOSFETs to those with a gate charge Q

G ≤ 9 nC for T1 and

G ≤ 5 nC for T2.

Figure 8. Optional Input Signal Filtering.

Figure 9. SID1102K with External Boosterstage.

PI-8536-110917

VCC

GND

SCALE-iDriver

DSTO

PI-8535-110917

VGXX

AUXGH

VISO

AUXGL

VEE

COM

VTOT

CS1

CS2

CGXX

RGON

RGOFF

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