ha16158fp Renesas Electronics Corporation., ha16158fp Datasheet - Page 15

• Manufacturer Part Number: ha16158fp
• Description: Pfc & Pwm Control Ic
• Manufacturer: Renesas Electronics Corporation.

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.
PWM-COMP
PWM-OUT
RT
9
Oscillator
f
Power Saving Peripheral Circuit
Divider
f/64
R
S
Q
reset
Figure 5
PWM
Logic
Power Saving
−
+
−
+
driver
1.7V
15
16
2
PWM-OUT
PWM-CS
PWM-COMP
Rev.0, Aug. 2002, page 15 of 23
f/64
HA16158P/FP
VREF
1.7V