HA16120 RENESAS [Renesas Technology Corp], HA16120 Datasheet - Page 35

• Manufacturer Part Number: HA16120
• Description: Switching Regulator for Chopper Type DC/DC Converter
• Manufacturer: RENESAS [Renesas Technology Corp]

HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
Overall Waveform Timing Diagram (for Application Example (1))
Rev.2.0, Sep.18.2003, page 35 of 37
V
V
V
V
V
PWM
pulse
DC/DC output
(example for
positive
voltage)
IC operation
status
Note: 1. This PWM pulse is on the step-down/inverting control channel (HA16114).
V
V
V
E/O
CT
DB
CL
OUT
IN
TM
ON/
,
,
*1
,
OFF
12 V
0 V
0.0 V
12 V
11.8 V
0 V
12 V
0 V
Power-up
The booster control channel (HA16120) output consists of alternating L and H of the IC on cycle.
1.4 V
3.0
2.0
1.0
0.0
(V)
2.1 V
IC on
V
sawtooth wave
V
CT
DB
V
E/O
Soft start
V
V
TM
ON/
,
OFF
On
Pulse-by-pulse
current limiting
Steady state
1.4 V
0.7 V
Off
Overcurrent
detected;
intermittent
operation
On
Off
On
Off
On
Off
Overcurrent
subsides;
steady-state
operation
On
Power supply off,
IC off
Off
Quick
shutdown