ha16158 Renesas Electronics Corporation., ha16158 Datasheet - Page 16

• Manufacturer Part Number: ha16158
• Description: Pfc & Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

HA16158P/FP
5. Power Saving in Standby State (for PWM Control)
When the output load is light, as in the standby state, the operating frequency of the PWM control section is
automatically decreased in order to reduce switching loss.
Standby detection is performed by monitoring the PWM-COMP voltage, and the operating frequency is decreased to a
maximum of 1/64 of the reference frequency determined by an external timing resistance.
As standby detection is performed on a reference frequency pulse-by-pulse basis, the frequency varies gently according
to the output load.
Rev.2.00 Jan 30, 2007 page 16 of 23
PWM-COMP
PWM-OUT
RT
9
Oscillator
f
Power Saving Peripheral Circuit
Divider
f/64
R
S
Q
reset
Figure 6
PWM
Logic
Power Saving
−
+
−
+
driver
1.7V
15
16
2
PWM-OUT
PWM-COMP
PWM-CS
f/64
VREF
1.7V