HCPL-5301 查看數據表（PDF） - HP => Agilent Technologies

零件编号

产品描述 (功能)

生产厂家

HCPL-5301

Intelligent Power Module and Gate Drive Interface Hermetically Sealed Optocouplers

HP => Agilent Technologies 

9

common mode failure will occur.

Even if the LED momentarily

turns on, the 100 pF capacitor

from pins 6-5 will keep the

output from dipping below the

threshold. The recommended

LED drive circuit (Figure 13)

provides about 10 V of margin

between the lowest optocoupler

output voltage and a 3 V IPM

threshold during a 10 kV/ µs

transient with VCM = 1000 V.

Additional margin can be

obtained by adding a diode in

parallel with the resistor, as

shown by the dashed line connec-

tion in Figure 18, to clamp the

voltage across the LED below

VF(OFF).

Since the open collector drive

circuit, shown in Figure 19,

cannot keep the LED off during a

+dVCM/dt transient, it is not

desirable for applications

requiring ultra high CMRH

performance. Figure 20 is the AC

equivalent circuit for Figure 16

during common mode transients.

Essentially all the current flowing

through CLEDN during a +dVCM/dt

transient must be supplied by the

LED. CMRH failures can occur at

dv/dt rates where the current

through the LED and CLEDN

exceeds the input threshold.

Figure 21 is an alternative drive

circuit which does achieve ultra

high CMR performance by

shunting the LED in the off state.

IPM Dead Time and

Propagation Delay

Specifications

These devices include a

Propagation Delay Difference

specification intended to help

designers minimize “dead time” in

their power inverter designs.

Dead time is the time period

during which both the high and

low side power transistors (Q1

and Q2 in Figure 22) are off. Any

overlap in Q1 and Q2 conduction

will result in large currents

flowing through the power

devices between the high and low

voltage motor rails.

To minimize dead time the

designer must consider the

propagation delay characteristics

of the optocoupler as well as the

characteristics of the IPM IGBT

gate drive circuit. Considering

only the delay characteristics of

the optocoupler (the character-

istics of the IPM IGBT gate drive

circuit can be analyzed in the

same way) it is important to

know the minimum and maximum

turn-on (tPHL) and turn-off (tPLH)

propagation delay specifications,

preferably over the desired

operating temperature range.

The limiting case of zero dead

time occurs when the input to Q1

turns off at the same time that the

input to Q2 turns on. This case

determines the minimum delay

between LED1 turn-off and LED2

turn-on, which is related to the

worst case optocoupler propaga-

tion delay waveforms, as shown

in Figure 23. A minimum dead

time of zero is achieved in Figure

23 when the signal to turn on

LED2 is delayed by (tPLH max -

tPHL min) from the LED1 turn off.

This delay is the maximum value

for the propagation delay

difference specification which is

specified at 500 ns for the

HCPL-530X over an operating

temperature range of -55°C to

+125°C.

Delaying the LED signal by the

maximum propagation delay

difference ensures that the mini-

mum dead time is zero, but it

does not tell a designer what the

maximum dead time will be. The

maximum dead time occurs in the

highly unlikely case where one

optocoupler with the fastest tPLH

and another with the slowest tPHL

are in the same inverter leg. The

maximum dead time in this case

becomes the sum of the spread in

the tPLH and tPHL propagation

delays as shown in Figure 24. The

maximum dead time is also

equivalent to the difference

between the maximum and

minimum propagation delay

difference specifications. The

maximum dead time (due to the

optocouplers) for the HCPL-530X

is 670 ns (= 500 ns - (-170 ns))

over an operating temperature

range of -55°C to +125°C.

Share Link: