r2j20658bnp Renesas Electronics Corporation., r2j20658bnp Datasheet - Page 12

• Manufacturer Part Number: r2j20658bnp
• Description: Integrated Driver - Mos Fet Drmos
• Manufacturer: Renesas Electronics Corporation.

R2J20658BNP
PWM & LSDBL#
The PWM pin is the signal input pin for the driver chip. When the PWM input is high, the gate of the high-side MOS
FET (GH) is high and the gate of the low-side MOS FET (GL) is low.
When the PWM input becomes middle voltage or high impedance, Zero Current Detection (ZCD) function works.
Figure 2 shows the operation diagram of PWM input and inductor current (IL).
The equivalent circuit for the PWM-pin input is shown in the next figure. PWM SW is in the ON state during normal
operation; if DISBL#-pin input is Low or Open State, the PWM SW is turned off.
R07DS0550EJ0101 Rev.1.01
Sep 30, 2011
Middle
PWM
Open
or
H
L
PWM Pin
GH
H
L
L
L
PWM
GH
GL
IL
DISBL# signal
3.3V
1.4V
GL
H
H
L
L
Figure 3 Equivalent Circuit for the PWM-pin Input
PWM
SW
Figure 2 ZCD Operation Diagram
> 0
 0
IL
*
*
Reg5V
18.5k
12.5k
Logic
Input
Tri-state
detection signal
To internal control
Page 12 of 15
Preliminary