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NCP51530 Datasheet(PDF) 22 Page - ON Semiconductor

Part No. NCP51530
Description  High Frequency High and Low Side Driver
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP51530 Datasheet(HTML) 22 Page - ON Semiconductor

 
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NCP51530
www.onsemi.com
22
VCC CAPACITOR SELECTION
VCC capacitor value should be selected at least ten times
the value of Cboot. In this case thus CVCC > 2 mF.
Rgate SELECTION
Rgate are selected to limit the peak gate current during
charging and discharging of the gate capacitance. This
resistance also helps to damp the ringing due to the parasitic
inductances.
For example for a Rgate value of 5 W, the peak source and
sink currents would be limited to the following values.
Rgate + 5W
(eq. 6)
ILO_Source +
VCC
RLgate ) RLOH
+
15 V
6.7 W
+ 2.23 A (eq. 7)
ILO_Sink +
VCC
RLgate ) RLOL
+
15 V
6.8 W
+ 2.20 A
(eq. 8)
IHO_Source +
VCC * VDboot
RLgate ) RHOH
+
14 V
6.7 W
+ 2.09 A (eq. 9)
IHO_Sink +
VCC * VDboot
RLgate ) RHOL
+
15 V * 1V
6.8 W
+ 2.06 A
(eq. 10)
TOTAL POWER DISSIPATION
Total power dissipation of NCP51530 can be calculated as
follows.
1. Static power loss of device (excluding drivers)
while switching at an appropriate frequency.
Poperating + Vboot *IBO ) VCC *ICCO
(eq. 11)
+ 14 V * 0.4 mA ) 15 V * 0.4 mA + 11.6 mW
IBO is the operating current for the high side driver
ICCO is the operating current for the low side driver
2. Power loss of driving external FET (Hard
Switching)
Pdrivers + Qg *Vboost ) Qg *VCC f
(eq. 12)
+ 30 nC * 14 V ) 30 nC * 15 V * 100 kHz + 87 mW
Qg is total gate charge of the MOSFET
3. Power loss of driving external FET (Soft
Switching)
Pdrivers + Qgs *Vboot ) Qgs *VCC *f
(eq. 13)
+ 4nC * 14 V ) 4nC * 15 V * 100 kHz + 11 mW
4. Level shifting losses
Plevelshifting + Vr ) Vb *Q* f
(eq. 14)
+ 415 V * 1 nC * 100 kHz + 41.5 mW
Vr is the rail voltage
Q is the substrate charge on the level shifter
5. Total Power Loss (Hard Switching)
Ptotal + Pdriver ) Poperating ) Plevelshifting
(eq. 15)
+ 11.6 mW ) 87 mW ) 40 mW + 138.6 mW
6. Junction temperature increase
tJ + RqJA *Ptotal + 183 * 0.14 + 25° C
(eq. 16)


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