Datasheet

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APPLICATION INFORMATION
7.5 mA
τ d ( µ s) = 145C
T
( µ f)
ID
ID *
3.6
R
T
(
kW
)
Oscillator frequency is approximated by the formula: f
T
(kHz) ≈
2.2
R
T
(kW) C
T
(mf)
Error amplifier can source up to 0.5 mA.
V
REF
V
REF
Z
S
Z
F
0.5 mA
I
F
< 0.5 mA
Comp
7
6
5
Open-Loop Voltage Gain (dB)
Open-Loop Phase
Frequency (Hz)
V
IN
= 20 V
T
A
= 255C
UC1846-EP
CURRENT-MODE PWM CONTROLLER
SGLS329 – MAY 2006
Output deadtime is determined by the external capacitor, C
T
, according to the formula:
I
D
= Oscillator discharge current at 25 ° C is typically 7.5 mA.
For large values of R
T
: τ d ( µ s) ≈ 145C
T
( µ f)
Figure 2. Oscillator Circuit
Figure 3. Error-Amplifier Output Configuration
Figure 4. Error-Amplifier Gain and Phase vs Frequency
7
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