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PDF HA16121FPJ Data sheet ( Hoja de datos )
| Número de pieza | HA16121FPJ | |
| Descripción | Switching Regulator for Chopper Type DC/DC Converter | |
| Fabricantes | Hitachi Semiconductor | |
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HA16116FP/FPJ, HA16121FP/FPJ
Switching Regulator for Chopper Type DC/DC Converter
Description
HA16116FP/FPJ and HA16121FP/FPJ are dual-channel PWM switching regulator controller ICs for use in
chopper-type DC/DC converters.
This IC series incorporates totem pole gate drive circuits to allow direct driving of a power MOS FET. The
output logic is preset for booster, step-down, or inverting control in a DC/DC converter. This logic
assumes use of an N-channel power MOS FET for booster control, and a P-channel power MOS FET for
step-down or inverting control.
HA16116 includes a built-in logic circuit for step-down control only, and one for use in both step-down
and inverting control. HA16121 has a logic circuit for booster control only and one for both step-down and
inverting control.
Both ICs have a pulse-by-pulse current limiter, which limits PWM pulse width per pulse as a means of
protecting against overcurrent, and which uses an on/off timer for intermittent operation. Unlike
conventional methods that use a latch timer for shutdown, when the pulse-by-pulse current limiter
continues operation beyond the time set in the timer, the IC is made to operate intermittently (flickering
operation), resulting in sharp vertical setting characteristics. When the overcurrent condition subsides, the
output is automatically restored to normal.
The dual control circuits in the IC output identical triangle waveforms, for completely synchronous
configuring a compact, high efficiency dual-channel DC/DC converter, with fewer external components
than were necessary previously.
Functions
• 2.5 V reference voltage (Vref) regulator
• Triangle wave form oscillator
• Dual overcurrent detector
• Dual totem pole output driver
• UVL (under voltage lock out) system
• Dual error amplifier
• Vref overvoltage detector
• Dual PWM comparator
1 page  
Block Diagram
HA16116FP/FPJ, HA16121FP/FPJ
5
5 Page 
HA16116FP/FPJ, HA16121FP/FPJ
To Vref
CT
VDB R1 E/O
DB
5k
PWM
comparator VIN
−
+
+
CST R2
From UVL 0.8V
VTH
VE/O
VDB
VTL
Booster
channel
On
tOFF tON
PWM
pulse
output
Step-down/
inverting
channel
On
Off
Off
T
1.6 V typ
1.0 V typ
VIN
GND
VIN
GND
Figure 3.1 Dead Band Duty Setting
3.2 Soft Start (SST) Setting (each channel)
When the power is turned on, the soft start function gradually raises VDB (refer to section 3.1), and the
PWM output pulse width gradually widens. This function is realized by adding a capacitor CST to the DB
pin. The function is realized as follows.
In the figure 3.2, the DB pin is clamped internally at approximately 0.8 V, which is 0.2 V lower than the
triangle wave VTL = 1.0 V typ.
tA: Standby time until PWM pulse starts widening.
tB: Time during which SST is in effect.
During soft start, the DB pin voltage in the figure below is as expressed in the following equation.
−t − t0.8
VSST = VDB ⋅ 1 − e T , tSST = tA + tB
Here,
t0.8 = −T ln
1 − 0.8
VDB
,
T = CST ⋅ (R1 // R2)
How to select values: If the soft start time tSST is too short, the DC/DC converter output voltage will tend to
overshoot. To prevent this, set tSST to a few tens of ms or above.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HA16121FPJ.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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