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UCC39422N Datasheet

  • UCC39422N

  • Multimode High Frequency PWM Controller

  • 602.94KB

  • 35页

  • TI

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UCC29421, UCC29422, UCC39421, UCC39422
MULTIMODE HIGH FREQUENCY PWM CONTROLLER
SLUS246C 鈭?OCTOBER 1999 鈭?REVISED FEBRUARY 2005
electrical characteristics over recommended operating free-air temperature range, T
A
= 鈭?0掳C to
85掳C for the UCC2942x, 0掳C to 70掳C for the UCC3942x, R
T
= 100 k鈩? V
VPUMP
= 6 V, V
VIN
= 3 V.
PARAMETER
Voltage Detection Section (UCC39422 Only)
Threshold voltage
Output low voltage
Output leakage
I = 5 mA
LOWBAT = 8 V
1.18
1.26
0.15
0.05
1.34
0.3
0.25
V
V
碌A
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PIN DESCRIPTIONS
COMP:
This is the output of the transconductance error amplifier. Connect the compensation components from
this pin to ground.
CHRG:
This is the gate drive output for the N-channel charge MOSFET. Connect it to the gate directly, or through
a low-value gate resistor.
CP:
This is the input for the charge pump. For applications requiring a charge pump, connect this pin to the
charge pump diode and flying capacitor, as shown in the applications diagram of Figure 4. For applications
where no charge pump is required, this pin should be grounded.
FB:
The feedback input is the inverting input to the transconductance error amplifier. Connect this pin to a
resistive divider between V
OUT
and ground. The output voltage is regulated to:
V
OUT
+
1.235
(R1
)
R2)
R1
where R1 goes to GND and R2 goes to VOUT.
GND:
This is the signal ground pin for the device. It should be tied to the local ground plane.
ISENSE:
This is the input to the X10 wide bandwidth current-sense amplifier. Connect this pin to the high side
of the current-sense resistor. An internal current is sourced out this pin for slope compensation. For applications
requiring slope compensation (or filtering of the current-sense signal), use a resistor in series with this pin.
LOWBAT:
This is the open drain output of the uncommitted comparator. (UCC39422 only). This output is low
when the VDET pin is above 1.25 V.
PFM:
This is the programming pin for the PFM (pulse frequency modulation) mode threshold. Connect this pin
to a resistive divider off of the FB pin (or VOUT) to set the PFM threshold. To disable PFM Mode, connect this
pin to ground (below 0.2 V).
PGND:
This is the power ground pin for the device. Connect it directly to the ground return of the current-sense
resistor.
RECT:
This is the gate drive output for the synchronous rectifier. Connect it to the gate of the P- or N-channel
MOSFET directly, or through a low value gate resistor.
RSEN:
This pin is used to sense the voltage across the synchronous rectifier for commutation. In boost
configurations, connect this pin through a 1-k鈩?resistor to the junction of the two MOSFETs and the inductor.
In flyback and SEPIC configurations, connect this pin through a 1-k鈩?resistor to the junction of the drain of the
synchronous rectifier and the secondary side winding of the coupled inductor.
RSADJ:
A capacitor from this pin to ground sets the reset delay. (UCC39422 only)
RSEL:
This pin programs the device for N- or P-channel synchronous rectifiers by inverting the phase of the
RECT gate drive output. Connect this pin to ground for N-channel MOSFETs, connect it to V
IN
for P-channel
MOSFETs.
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
5

UCC39422N 产品属性

  • 20

  • 集成电路 (IC)

  • PMIC - 稳压器 - DC DC 切换控制器

  • -

  • 电流/电压模式

  • 1

  • 2MHz

  • 88%

  • 1.8 V ~ 8 V

  • 是

  • 是

  • 是

  • 无

  • 无

  • 无

  • 无

  • 无

  • 0°C ~ 70°C

  • 20-DIP（0.300"，7.62mm）

  • 管件

  • 296-11546-5

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