Notes:
Note 1. A flyback supply voltage of > 50V up to 60V is allowed in application. A 22–nF capacititor
in series with a 22Ω resistor (depending on IO and the inductance of the coil) has to be con-
nected between Pin7 and GND. The decoupling capacitor of VFB has to be connected be-
tween Pin6 and Pin3. This supply voltage line must have a resistance of 33Ω.
Note 4. The linearity error is measured without S–correction and based on the same measurement
principle as performed on the screen. The measuring method is as follows:
Divide the output signal I4 – I7 (VRM) into 22 equal parts ranging from 1 to 22 inclusive. Measure
the value of two succeeding parts called one block starting with part 2 and 3 (block 1) and ending
with part 20 and 21 (block 10). Thus part 1 and 22 are unused. The equations for linearity error
for adjacent blocks (LEAB) and linearity error for not adjacent blocks (LENAB) are given below:
LEAB =
ak – a(k + 1)
aavg
Note 5. Referenced to VP.
; LEAB =
amax – amin
aavg
Note 6. The V values within formulae relate to voltages at or across relative pin numbers, i.e.
V7–4/V1–2 = voltage value across Pin7 and Pin4 divided by voltage value across Pin1 and Pin2.
Note 7. V9–4 AC short–circuited.
Note 8. Frequency response V7–4/V9–4 is equal to frequency response V7–4/V1–2.
Note 9. At V(ripple) = 500mV eff; measured across RM; fi = 50Hz.
Pin Connection Diagram
(Front View)
9 VI(fb)
8 VO(guard)
7 VO(A)
6 VFB
5 GND
4 VO(B)
3 VP
2 Idrive(neg)
1 Idrive(pos)