mc33253 Freescale Semiconductor, Inc, mc33253 Datasheet - Page 10

• Manufacturer Part Number: mc33253
• Description: Full Bridge Pre-driver
• Manufacturer: Freescale Semiconductor, Inc

Tosc2 is on, the oscillator is at high level. The high side MOSFET predriver is composed of two transistors T1 and T2. When T1 is on
the HS MOSFET is turn on, when T2 is on the HS MOSFET is off. The capacitor C
through T1 during turn on (3) as shown in figure 11.
C
influence of C
(MTP60N06HD and MPT36N06V).
cp
The Figure 8 represents a simplified circuitry of the high side gate driver.
The transistors Tosc1 and Tosc2 are the oscillator switching MOSFETs. When Tosc1 is on, the oscillator is at low level. When
C
MC33253
cp
choice depends on Power MOSFET characteristics and the working switching frequency. The following diagrams show the
cp
20.5
19.5
18.5
21
20
19
18
value on V
5
MTP60N06HD (Q
25
cp_out
45
Ccp (nF)
average voltage level. The diagrams are given at two different frequencies for two power MOSFETs
65
V
pins
LR-OUT
g
=50nC)
T1
T2
Freescale Semiconductor, Inc.
85
Tosc2
Tosc1
For More Information On This Product,
C1
Ccp
Figure 8. High Side Gate Driver
Figure 9. V
GATE_HS
C2
Go to: www.freescale.com
20KhZ
100 KhZ
SRC_HS
(3)
Rg
Figure 10.
cp_out
MC33253
Vcc
MOTOROLA
CP_out
D1
D2
Versus C
LS
MOSFET
Ccp_out
HS
MOSFET
21.5
20.5
19.5
18.5
21
20
19
5
cp
M
MTP36N06V (Q
cp_out
25
provides peak current to the HS MOSFET
45
Ccp (nF)
65
g
=40nC)
85
20kHz
100kHz
rev3.0 - 10/15