Datasheet

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UCC28950
DCM
RSUM
RT
TMIN
DELEF
DELCD
DELAB
SS/EN
COMP
EA-
EA+
VREF 24
23
22
21
20
19
18
17
16
15
14
13ADELEF
ADEL
CS
SYNC
OUTF
OUTE
OUTD
OUTC
OUTB
OUTA
VDD
GND
UCC28950
www.ti.com SLUSA16B –MARCH 2010–REVISED OCTOBER 2011
DEVICE INFORMATION
Plastic 24-pin TSSOP (PW)
TERMINAL FUNCTIONS
TERMINAL
I/O FUNCTION
NUMBER NAME
1 VREF O 5-V, ±1.5%, 20-mA reference voltage output.
2 EA+ I Error amplifier non-inverting input.
3 EA- I Error amplifier inverting input.
4 COMP I/O Error amplifier output and input to the PWM comparator.
5 SS/EN I Soft-start programming, device enable and hiccup mode protection circuit.
6 DELAB I Dead-time delay programming between OUTA and OUTB.
7 DELCD I Dead-time delay programming between OUTC and OUTD.
8 DELEF I Delay-time programming between OUTA to OUTF, and OUTB to OUTE.
9 TMIN I Minimum duty cycle programming in burst mode.
10 RT I Oscillator frequency set. Master or slave mode setting.
11 RSUM I Slope compensation programming. Voltage mode or peak current mode setting.
12 DCM I DCM threshold setting.
Delay-time programming between primary side and secondary side switches, T
AFSET
13 ADELEF I
and T
BESET
.
Dead-time programming for the primary switches over CS voltage range, T
ABSET
and
14 ADEL I
T
CDSET
.
15 CS I Current sense for cycle-by-cycle over-current protection and adaptive delay functions.
16 SYNC I/O Synchronization out from Master controller to input of slave controller.
17 OUTF O 0.2-A sink/source synchronous switching output.
18 OUTE O 0.2-A sink/source synchronous switching output.
19 OUTD O 0.2-A sink/source primary switching output.
20 OUTC O 0.2-A sink/source primary switching output.
21 OUTB O 0.2-A sink/source primary switching output.
22 OUTA O 0.2-A sink/source primary switching output.
23 VDD I Bias supply input.
24 GND Ground. All signals are referenced to this node.
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