mc33253 Freescale Semiconductor, Inc, mc33253 Datasheet - Page 8

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

Driver Supply
approx. 3.5 mA (f
7.0 mA for the low side. (Note: The average current required to switch a gate with a frequency of 100kHz is: Average Current
(Charge Pump) for PWM Frq. (f
and one low side at the same time.)
switching. The Low Side Driver is supplied from built in low drop regulator.
Gate Protection
V
internally, in order to avoid a V
voltage that can appear when driving inductive load.This Flyback voltage can reach high negative voltage values and needs to
be clamped externally.
TMOS Failure Protection
= V
protected against short circuits to ground.
Cross Conduction Suppression
which prevents the half bridge power FETs of a shoot-through condition. The CCS can be disabled / enabled by an external
signal (/CCS).
MC33253
GS
The High Side Driver is supplied from the internal charge pump buffered at CP_OUT. The low-drop regulator provides
External capacitors on Charge Pump and on Linear Regulator are necessary to supply high peak current absorbed during
The low side gate is protected by the internal linear regulator, which guarantees that V
The Gate protection does not include a Flyback Voltage Clamp that protects the driver and the external FET from a Flyback
All output driver stages are protected against TMOS failure conditions. If one of the external power FETs is destroyed (Gate
CC
The purpose of the cross conduction suppression is to avoid that high and low side FET are turned on at the same time,
- /CCS=0, the cross conduction is not allowed.
- /CCS=1, the cross conduction is allowed.
. Especially when working with the charge pump the voltage at POS_HS can be up to 65V. The high side gate is clamped
, or Gate = Gnd) the function of the remaining output driver stages is not affected. All output drivers are short circuit
PWM
= 50kHz) per gate. In case of the full bridge that means approximately. 14 mA; 7.0 mA for the high side and
GS
PWM
exceeding 14V.
Freescale Semiconductor, Inc.
) and I
Figure 5. Gate Protection and Flyback Voltage Clamp
For More Information On This Product,
V
G_LOW
G_LOW
gs_ls
CP
IN
IN
= Q
Output
Output
Driver
Driver
g
*f
Go to: www.freescale.com
PWM
V
gs_hs
OUT
OUT
= 75 nC*100 kHz = 7.5mA. A full bridge application switch only one high side
MC33253
SRC_HS
GATE_HS
GATE_LS
MOTOROLA
D
cl
M
M
1
2
L
1
Flyback Voltage
V
Inductive
conditions
under all
Clamp
GS
V
< 14 V
CC
GATE_LS
does not exceed the maximum
rev3.0 - 8/15